The fee people argue about is almost never the fee that took their money. Sellers compare platform percentages the way drivers compare fuel prices, then post a four-dollar card in a rigid mailer and cannot work out where the four dollars went. The percentage was not the problem. The problem is that every sale is charged twice over — once in a currency that scales with the card, and once in a currency that does not care what the card is worth at all.

▸ THE QUICK VERSION

Two kinds of cost come off a sale. Shares rise and fall with the price. Flats stay exactly where they are.

On a cheap card the flats are the entire story, and no platform choice will save you from them.

Every collection has a floor — a price below which one card in one parcel cannot win. Find yours once and you never have to think about it again.

The biggest lever is not which site you sell on. It is how many cards ride in one envelope.

Two costs, and only one of them cares about the card

SHARES AND FLATS

The platform's cut is a share. On eBay it is called the final value fee, and it is charged against the whole order total — the item, whatever the buyer paid for postage, and the tax. Payment processing is a share too. Both behave identically: double the card, double the money they take, and the fraction you keep does not move a hair.

Everything else on a sale is flat. The rigid mailer. The toploader and the penny sleeve inside it. The tape, the label, the trip to the post office. The postage itself, which on the cheapest tracked service in the United States — USPS Ground Advantage, the class that replaced First-Class Package in 2023 — costs what it costs whether the card inside is worth four dollars or four hundred. Most marketplaces also add a small per-order charge on top of the percentage: a flat handful of cents that is invisible on a fifty-dollar sale and is not invisible on a five-dollar one.

That indifference is the whole subject of this page. A flat cost does not know what it is protecting. Draw the two side by side at three different prices and the argument finishes itself.

▸ THE SAME STACK, THREE PRICES

Every bar is one whole headline price. The blue block never moves; the copper block is what changes.

All three bars are the same length on purpose: each one is a whole headline price, so the widths read as shares of it. The blue block is drawn at fifteen per cent and is the same width on every bar — that is what a percentage does, and it is why arguing about percentages moves so little. The copper block is one flat cost, unchanged in money and therefore shrinking as a share: half the bar at twice the flat cost, a sixth at six times, a twentieth at twenty times. The kept figures follow from the arithmetic, not from any fee schedule. None of the three bars is the floor: the floor this page arrives at sits at four times the flat cost, between the top bar and the middle one. Rates change constantly; the behaviour does not.

Read the top bar honestly. On a card priced at twice what it costs to get it there, half the money is gone before anyone has taken a percentage of anything, and about a third of the headline reaches you. Move to twenty times the flat cost and the same flat cost has become a rounding error. The card did not get better. The card got dearer, and the flats simply stopped mattering.

This is why the useful question is not what does this platform charge. It is what multiple of my flat cost is this card — because that single ratio decides whether the sale is worth making at all, and it is a number you can work out in your head once you have measured the flat cost once.

Nobody loses money to a percentage. They lose it to a mailer that costs the same either way.

Find your floor in one sitting

THE PROCEDURE

Post one card the way you normally would

Not a special careful version for the experiment. The ordinary way, with your usual mailer and your usual service. You are measuring your habits, not your intentions.

Add every flat cost into one number

Postage, mailer, toploader, sleeve, tape, label, and the platform's per-order charge. Divide packs of mailers and sleeves down to the unit. That single number is your flat cost, and it is the only figure on this page you need to keep.

Multiply it by four

At four times your flat cost, the flats take a quarter of the headline price and the shares take their percentage of that same headline — not of what is left. Against a fifteen per cent share that leaves about sixty per cent of the price reaching you, which is roughly where a single listing starts being worth an afternoon. Call it the floor.

Sort the collection against it, once

Anything comfortably above the floor gets its own listing. Anything near or below it goes into the lot pile and never gets thought about individually again. Re-measure only when postage changes.

The floor is personal. Someone shipping in plain envelopes with no tracking has a much lower floor and carries the risk of every lost card themselves. Someone who insures everything has a high one. Both are correct; they are answers to different questions about how much loss you can stand.

▸ THE SAME FIFTY CARDS

The percentage cannot be bundled away. Forty-nine flat costs can.

Every copper unit is one flat cost, drawn at the same size in both halves — fifty of them above, one below. A bulk lot fetches less per card than fifty patient individual sales would. It also pays one postage, buys one mailer and costs one afternoon instead of fifty. For anything sitting near the floor, that trade is not laziness — it is the only version of the sale that was ever going to net you anything.

Four levers that actually move the number

IN ORDER OF HOW MUCH THEY MATTER

Put more cards in one parcelThis is the only lever that changes the flats, and the flats are what is hurting you. Combined postage for a buyer taking three cards, or a single lot for the bottom half of a collection, does more for what reaches you than any other decision on this list.

Do not pad the postage linePadding does not dodge the share — the fee is charged on the whole order total, postage included, so the same money costs you the same either way. What padding costs you is the buyer. People sort and compare on the delivered total, and a four-dollar card sitting behind a nine-dollar postage line reads as a trick next to an identical card with the postage folded into the price. Charge what it costs, or charge nothing and price it in.

Match the packaging to the card, not to your nervesA card worth twenty times your flat cost deserves a rigid mailer and tracking. A common card in a bulk lot does not need the same armour, and buying it that armour is how people turn a small profit into a small loss. Whatever you choose, say so in the listing.

Sell the cheap half once, and stop revisiting itThe hours are a flat cost too, and they are the one nobody invoices for. A collection sorted against the floor gets sold in two passes instead of two hundred, which is usually the difference between finishing and giving up.

Notice that none of the four is “find a platform that charges less”. Shaving a point off a percentage on a five-dollar card saves you five cents. Putting ten of those cards in one envelope saves you nine postages.

Where the stack stops being the enemy

WHERE THIS PAGE LANDS

Above the floor, all of this evaporates. On a card worth twenty times what it costs to send, the flats are noise and the only question left is whether you priced it right — which is a different skill entirely, and the subject of checking prices and of market basics. The fee stack is not a trap. It is simply the reason that a hobby full of two-dollar cards has always been sold in boxes rather than one card at a time.

Work your flat cost out on a real sale this week, multiply it by four, and write the number on the inside of the box lid. It answers whether a card goes up on its own; the other guide standing in this chapter, timing a sale you have already decided to make, answers when. Everything else on this chapter's list gets easier once you have the number.

How to Sell a Card Without Losing to Fees