Why a vanished listing is not a sale

Here is a problem almost every card price tool has, and almost none of them tell you about. A listing you were watching is gone. It was up at $180 yesterday; today the URL is dead. Did it sell for $180?

Maybe. It might also have been pulled by a seller who changed their mind, expired without a buyer, been relisted at a different price under a new number, been removed by eBay, or been ended because the seller sold the card somewhere else entirely. Those are five different events, and only one of them is a $180 sale.

Two claims that look identical in a spreadsheet

Write both down and the difference is obvious:

• “This card changed hands at $180.” Somebody witnessed a transaction.
• “This listing went away while priced at $180.” Nobody witnessed anything.

The second one is real information — it is weak evidence that somebody was willing to pay around $180 — but it is not a price. Average enough of them into a “fair value” and you have built a number out of things that may never have happened.

Why the difference is systematically biased, not just noisy

If disappearances were sales half the time at random, they would only add noise. They are worse than that, because the reasons a listing vanishes are not independent of its price. A card priced far above the market does not sell — but it does get pulled and relisted, repeatedly, by a seller chasing a number. Overpriced listings therefore disappear more often per sale than fairly priced ones do.

Count disappearances as sales and you have systematically imported the asks nobody agreed to. The estimate does not just get fuzzier; it drifts upward, and it drifts upward most for exactly the cards where a buyer most needs an honest number.

The evidence ladder

So every recorded price on this site carries a status saying what kind of evidence it is, and only some of them are allowed to move a valuation:

The last row is the whole point, and it has a name here — a tracked disappearance. Those records are not deleted or hidden; they are genuinely useful context, and a card with twelve disappearances is telling you something about demand. They simply never get averaged into a number that a buy decision leans on.

What to do with this by hand

• Treat “it's gone, so it sold” as a hypothesis, not a data point. On eBay, a completed listing showing an actual sold price is evidence; a dead link is not.
• Be most suspicious of vanished listings priced well above the rest of the market. Those are the ones most likely to be a relist rather than a sale.
• Watch for the same card reappearing under a new item number days later. That is the relist you would otherwise have counted as a sale.
• When a tool quotes you a fair value, ask what it counts as a sale. If the answer is “listings that ended”, the number is an ask average wearing a sale's clothes.