One In, One Out: Living With a Board Game Shelf Cap

A board game shelf cap is the simplest collecting rule there is: pick a number of games, and never own more than that. When a new game comes in, one goes out. That is the whole system. It is also the single change most likely to turn a collection you manage into a collection you play.

This is the last article in our Smart Buying series, which began with how to buy used board games. Everything before it was about buying well. This one is about the constraint that makes buying well automatic, because once the shelf is full, every purchase has to answer a harder question than “do I want this?”

Why does a cap make a board game collection better?

The intuition is that a bigger collection is a better collection. In practice, past a certain size, the opposite is true.

A cap forces choice. Without a limit, the question before buying is “do I want this?” and the answer is almost always yes. With a limit, the question becomes “is this better than something I already own?” That is a much higher bar, and it is the right one. As the old hobby advice goes, with a collection cap you buy what fits the collection rather than what you merely want.

A cap protects the games you love. A shelf of thirty games gets played. A shelf of a hundred and thirty gets browsed. The more games on the shelf, the more each one competes for the same limited game nights, and the more the good ones get buried. A capped collection keeps the best games visible and in rotation.

A cap kills the Shelf of Shame. Unplayed games have an infinite cost per hour; that is the whole argument of The Shelf of Shame Has an Infinite Cost Per Hour. Under a cap, an unplayed game is not just a mild embarrassment. It is occupying a slot that a game you would play could have. That pressure gets it moved.

A cap makes the money go further. Every game that leaves under one-in-one-out gets sold or traded, and that money funds the next game. Your spending becomes a rotation instead of an accumulation. The cost per play of the collection as a whole goes down because the collection only holds games that get played.

How do you choose your number?

There is no right number. There is a right number for you, and a few ways to find it.

Start with the shelf. The most practical cap is physical: the number of games that fit on the shelf space you actually have, with every box visible and reachable. If the shelf is full, the cap is reached. This is easy to enforce and hard to argue with.

Start with the roles. The starter shelf idea is one game per role: gateway, filler, two-player, party, co-op, stretch. Six games cover most occasions. A cap of twelve gives you two per role. A cap of twenty-four gives you four. Pick the multiple that matches how often you play and how much variety your group wants.

Start with your plays. Look at a year of game nights. How many distinct games did you actually play? For most groups the honest answer is somewhere between ten and thirty. A cap that is a little above that number keeps room for new entries without inviting hoarding.

Start with where you are in the tiers. Someone building a core library might set a cap of twenty. Someone at the curator stage, with a collection past $1,000, might set it at forty or fifty and treat the cap as the main tool for keeping quality high. The number scales with the collection, but the rule does not change.

A few illustrations, nothing more:

If you are unsure, set the cap lower than feels comfortable. You can always raise it later; a cap that is too high does nothing.

How a new game earns its slot

Once the cap is set, the rule is one in, one out. The mechanics of that are where the system either works or quietly fails.

Name the outgoing game before you buy. This is the critical step. Not “I’ll figure out what to cull later.” Before the new game comes home, you have already decided which current game leaves and, ideally, where it is going. If you cannot name a game you are willing to let go, you have just learned that you do not want the new game as much as you thought.

The new game must beat the one it replaces. Ask it directly: will this get more plays than the game it is replacing? Will it fill a role the shelf is missing, or a role the outgoing game filled badly? Would my group choose it on a normal night? If the new game cannot beat the weakest game on the shelf, it does not get in. That is the whole point of the cap: the weakest game on the shelf is the bar.

Role for role when you can. If the outgoing game is your two-player game, the incoming game should ideally be a better two-player game. Swapping a two-player game for a third party game leaves a hole in the shelf. It is not a hard rule, but it keeps the collection balanced.

Count expansions as part of the base game. An expansion does not take a slot; it deepens one. This is also why expansions are so attractive under a cap. They let a game grow without costing shelf space.

Move the outgoing game within a month. The failure mode of one-in-one-out is the “out” pile that lives in a closet for a year. Set a deadline. Trade it, sell it, or give it away, with your own play group first. If it is still in the closet after a month, it is still on your shelf, and the cap is a lie.

The annual cull

One-in-one-out handles the day-to-day. Once a year, do a bigger pass.

Pick a date, ideally right after a convention or a holiday when the shelf has been stress-tested. Go through every game and ask:

1. Did this get played in the last twelve months?
2. If not, is there a specific play scheduled, or a real reason it is waiting?
3. Does it fill a role nothing else on the shelf fills better?
4. Would I buy it again today, at today’s price, knowing what I know?

Anything that fails questions one and two and does not survive three and four goes on the out list. Move the out list within a month.

The cull catches the games that slipped in under the cap on a good argument and then never got played, and it frees up slots in a batch so you can take a chance on something new. A game you love and play twice a year has a place. A game you admire and never play does not.

The cap as a group practice

Everything above works for one person’s shelf. It works even better for a group’s.

Under The One Copy Rule, a play group’s collection is one library spread across several homes. That library can have a cap too, and the cap does the same job at group scale: it forces the group to choose, keeps the best games in rotation, and turns duplicates and dead weight into money for games the group will play.

A group cap works like this:

• Set the number together. Add up what the group plays in a year and set the cap a little above it. Illustration: a weekly group of four might cap the shared shelf at thirty.
• Divide it by lane. If your group uses Claim a Lane, each person’s lane gets a share of the cap. The co-op person has eight slots; the party person has six. Each person manages their own slots under the same rule.
• One in, one out across the group. When anyone wants to add a game, the group asks which game leaves. Often the answer is a duplicate: two people own the same game, and one copy fails the second-copy test. Those are the easiest outs.
• Cull together once a year. The annual cull becomes a group event, ideally the same night as a shelf audit. Lay out the list, flag what has not been played, decide what goes, and run a mini math trade among yourselves before anything leaves the group.
• Let outgoing games move within the group first. A game leaving your shelf might be exactly what a friend’s lane is missing. It stays on the shared shelf; it just changes houses.

A cap keeps the shared library a size the group can actually know, and a library the group knows is a library the group plays.

Living with it

The first few months under a cap feel restrictive. Then something shifts. Buying becomes rarer and more satisfying because every purchase had to beat something. The shelf gets smaller and the game nights get better, because every box on it is one somebody at the table wants to play. That is what the cap is for. Not fewer games. Better ones, played more, with the same people.

FAQ

What is a board game shelf cap?

A shelf cap is a fixed limit on how many games you own. When the shelf is full, adding a game means removing one, which is the one-in-one-out rule. The cap forces every purchase to beat a game you already own, keeps your best games in rotation, and turns unplayed games into trade or sale money for games you will actually play.

How many board games should I own?

Enough to cover your regular occasions and no more than you can play. A useful starting point is one or two games per role: gateway, filler, two-player, party, co-op, and stretch. Most groups play ten to thirty distinct games a year, so a cap a little above your actual yearly plays is usually right. Start lower than feels comfortable.

How does one in one out work for board games?

Before buying a new game, name the game it will replace and decide where that game is going. The new game must earn its slot by promising more plays or filling a role the shelf lacks. Once the new game arrives, move the old one within a month by trading, selling, or giving it away, starting with your own play group.

How often should I cull my board game collection?

Once a year, in addition to the one-in-one-out rule for every new purchase. Go through every game and ask whether it was played in the last twelve months, whether it fills a role nothing else fills better, and whether you would buy it again today. Move anything that fails within a month so the freed slots are real.

More from Smart Buying

• How to Buy Used Board Games Without Getting Burned
• The One Copy Rule: Why Your Play Group Only Needs One Catan
• The Curator: Managing a Board Game Collection Past $1,000
• The Shelf of Shame Has an Infinite Cost Per Hour
• Trading and Selling Board Games You Don’t Play

That wraps the Smart Buying series. Subscribe to The Ludarium newsletter for the next series on running a play group, delivered as each article goes live. Togethering for a lifetime.