Pricing a collection before a convention without losing three days to it

The week before a convention has a particular kind of panic in it. There is a box of cards that need prices, a table you have already paid for, and the growing suspicion that pricing everything properly would take longer than the show itself lasts. Most vendors respond by pricing the expensive cards carefully and then guessing at everything else, which is roughly the right instinct applied without a system.

The system is worth having, because the guessing is where the money goes. Not on the chase card you researched for ten minutes — on the four hundred cards you waved through at a dollar each, thirty of which were worth eight.

Sort by what a mistake costs, not by what the card is

The usual instinct is to sort by set, or by rarity, or by whatever order the cards came out of the box. Sort instead by the cost of getting the price wrong. That produces three piles, and each pile gets a completely different amount of your attention.

• Cards where a mistake costs more than the time to check. Research these individually, every one.
• Cards where a mistake costs less than the time to check, but they are not worthless. These get a rule, not a decision.
• Cards where any price is more than the card will ever return. These should not be priced individually at all.

Where the boundaries sit depends on what your time is worth and how fast you look things up. If checking a card takes ninety seconds and you value your time at a modest hourly rate, the break-even is somewhere in the low single digits of currency. Anything above it, look it up. Anything below, do not.

The top pile: check the sold prices, not the asking prices

For the cards that justify individual research, the single most common error is pricing against listings rather than sales. An active listing is somebody's hope. A completed sale is a fact. On any marketplace that exposes both, the sold data is the number that matters, and the gap between the two can be enormous on cards that are slow to move.

Three things to look at while you are there, all of which change the price more than people expect:

• How recent the sales are. Five sales this month is a price. Two sales in the last year is a guess with a decimal point on it.
• The spread. If the same card in the same grade sold for widely different amounts, you are looking at a card where condition or printing is doing the work, and you need to identify which one you actually have.
• Whether the sales are the same printing. First edition, unlimited, reverse holo, promo stamps, and regional variants are different cards that share a name and, often, an image.

The middle pile: write rules, then stop thinking

The middle pile is where a show is won or lost, and it is entirely a discipline problem. The cards are individually cheap enough that thinking about them is a waste, and collectively valuable enough that ignoring them is worse.

The answer is a small set of rules you decide once, before you touch the cards, and then apply without revisiting. Something like: holos from recent sets at one price, older holos at another, anything from a set older than a certain year at a third, and playable staples at whatever the going rate is minus a margin. The exact rules matter far less than the fact that you are not re-deciding them four hundred times.

Two things make rules go wrong. The first is having too many of them — if the rule set does not fit on an index card, it is a research process wearing a rule's clothing. The second is exceptions. The moment you start pulling cards out of the rule because they feel like they might be worth more, you are back to researching, just with extra steps and no record of which cards you second-guessed.

If you genuinely cannot stop second-guessing a subset, that subset belongs in the top pile. Move it there deliberately at the start rather than discovering it card by card.

The bottom pile: sell the container, not the contents

Bulk is not a pricing problem. It is a packaging problem. A common from a set nobody plays is worth a fraction of a cent as a card and considerably more as one unit of something a customer wants to dig through.

The formats that work are the ones that give the buyer a reason to engage: a per-card price low enough to be impulse-priced, a bundle at a round number, a themed lot, or a dig box with a flat price and a promise that there is something decent in there. All of them price the container. None of them require you to have looked at the cards individually.

The mistake worth naming is spending real time deciding whether a bulk card is bulk. If you are holding a card and wondering, it is going in the box. The expected value of the occasional missed hit is lower than the cost of the deliberation, and it is much lower than the cost of arriving at the show with half the collection unpriced.

Price for the room you are actually in

Online sold data tells you what a card is worth to a global market with search, filters, and infinite patience. A convention table is a different market. The buyer standing in front of you cannot easily compare, is paying no shipping, is often buying on impulse, and will not come back next week.

That cuts in both directions. Cards with broad appeal — recognisable characters, current meta cards, anything a parent will buy for a child without checking — support a premium at a table. Cards that only a specialist wants often do worse than online, because the specialist may simply not walk past your table that weekend.

The practical version: mark up the obvious, discount the obscure, and be honest with yourself about which is which. A card you find fascinating is not automatically a card the room finds fascinating.

Leave yourself somewhere to move

Pricing at exactly the number you want to receive means every negotiation is a loss. Pricing high enough that nobody engages means there is no negotiation to have. The useful middle is a price that reads as reasonable at a glance, with enough room that you can bundle, round down, or throw something in without going under your floor.

Know your floor per card before the show, not during it. The floor is not what you paid — it is the lowest number at which you would rather have the cash than the card, given that carrying it home costs you another show's worth of shelf space. For a lot of stock, especially anything you have been carrying for a while, that number is well below cost, and refusing to accept it is how a box of cards becomes a permanent fixture in your car.

What to do with what you learn

The best time to fix your pricing is immediately after the show, while you can still remember which cards people picked up and put down. Write down what moved, what did not, and which prices you were talked out of. Three shows of that and your middle-pile rules stop being guesses and start being data — which is the whole point, because the middle pile is where most of the cards are and almost all of the wasted time.