The Population Growth Tax: Watching the Registry Eat the Premium in Real Time

Every graded card price rests on a denominator nobody watches closely: how many slabs exist. PSA publishes a snapshot; we record it every day, which means we hold something the price guides do not, a growth rate. Pair that with our verified PSA 10 sold medians and you can watch scarcity decay in real time. The result over our first measured window is blunt: registry growth is a tax on price, and the market pays it within weeks, not years.

+6.9% popfast growers, avg registry growthregistry windows of 15 to 18 days

+4.2%their average PSA 10 price change4 cards, price readings Jul 21 to Aug 10

+0.8% popslow growers, avg registry growthsame registry windows

+10.1%their average PSA 10 price change9 cards, and one of them carries it

The tape, eight of the thirteen cards (registry growth vs verified PSA 10 median change)

Card	Pop now	Pop growth	PSA 10 median move
Mega Dragonite ex, Ascended Heroes	7,996	+12.2% (+358/wk)	$1,595 to $1,523 (-4.5%)
Pikachu ex, Ascended Heroes	10,252	+10.5% (+399/wk)	$2,485 to $2,400 (-3.4%)
Umbreon ex, Prismatic Evolutions	21,003	+2.0% (+190/wk)	$6,775 to $6,225 (-8.1%)
Rayquaza V, Evolving Skies	18,910	+0.8% (+63/wk)	$1,565 to $1,400 (-10.5%)
Reshiram ex, White Flare	10,661	+2.7% (+117/wk)	$1,264 to $1,350 (+6.8%)
Victini, White Flare	5,347	+2.3% (+53/wk)	$1,338 to $1,575 (+17.7%)
Dark Charizard, Team Rocket	9,591	+0.9% (+34/wk)	$1,563 to $3,475 (+122.3%)
Lugia V, Silver Tempest	46,264	+0.7% (+117/wk)	$1,387 to $1,413 (+1.9%)

The mechanism

Four hundred new Pikachus a week

The Ascended Heroes chase cards are the cleanest specimens. Pikachu ex added roughly 399 slabs to its PSA registry every week of our window; Mega Dragonite ex added 358. Those are not old cards resurfacing, they are fresh submissions from a set still being ripped by the case. Both cards' verified PSA 10 medians fell across our nearest price readings, July 21 to August 10, while the broader index rose. That price window opens before the registry window and closes inside it, so read this as two overlapping tapes pointing the same way rather than as one clean measurement. Nothing went wrong with demand. Supply simply showed up faster than buyers did, and each new slab bid against the last one.

Now look at the other end. Dark Charizard from Team Rocket added 34 slabs a week to a registry of 9,591 between August 3 and August 20, growth of less than one percent, and its PSA 10 median went from $1,563 to $3,475 between our July 27 and August 3 readings. Two things follow, and the second is the one we nearly skipped. A vintage registry is nearly closed, so when demand arrives price is the only thing that can move. But that price pair is seven days apart, sits mostly before the registry window rather than inside it, and rests on six recorded sales rising to fifteen. It is the loudest number in this study and the thinnest, and it should be read as a card to watch rather than as a measurement.

The honest caveat, and it is bigger than we first wrote

Thirteen cards, and the two series are not the same window. Registry growth is measured over each card's own recorded population series, which run 15 to 18 days between August 3 and August 28, 2026. The PSA 10 medians are a different and sparser tape: for these cards our graded store holds readings on July 21, July 27, August 3 and August 10 and then nothing until August 28, so every price move above is the July 21 to August 10 pair, and Dark Charizard, which has no July 21 reading, is July 27 to August 3. That means the price change mostly PRECEDES the registry growth it sits beside, which is the wrong order for the causal story and reason enough to treat this as a first look rather than a result. The slow-grower average is thinner still: strip Dark Charizard out and the remaining slow growers in the table average about minus four percent, so the +10.1% is one card. We will re-run this when the graded tape is dense enough to share a window with the registry tape.

The takeaway

What to do with it

Before paying a scarcity premium on a modern slab, look at the submission rate, not the population. A pop of 10,000 that grows 1% a week is a different asset from a pop of 10,000 that grows 0.1% a week, and six months from now they will have very different denominators. Every graded card page on moonstone now carries its recorded population series, so the growth rate is one glance away.

Population counts are PSA registry totals recorded daily by moonstone per card (we record the snapshot on every graded-card page view and via a background job; series here span 15 to 18 days, the earliest starting August 3 and the latest ending August 28, 2026). Price moves compare the earliest and latest verified PSA 10 sold medians we hold for each card, and that is a SEPARATE and sparser window from the registry one: our graded store carries readings on July 21, July 27, August 3 and August 10, 2026 and then none until August 28, so the price pair is July 21 to August 10 for every card here except Dark Charizard, whose first reading is July 27 and whose second is August 3. An earlier version of this methodology said the two came from the same seventeen-day window; they do not, they barely overlap, and the body now says so. Medians are computed from eBay sold listings individually verified by our pipeline, minimum three sales, and the samples behind the Dark Charizard pair are six sales and fifteen, which is below the fifty-sale floor this site applies to a featured figure. The table prints eight of the thirteen cards. Cards in the sample are all thirteen with a 14-day-plus registry span and population above 50; the fast/slow split is at 2% window growth. Nothing here is modeled and nothing is financial advice.