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"My box doubled" is the most common sentence in sealed investing, and by itself it means almost nothing. Doubled over what period? Before or after selling costs? In dollars that still buy what they used to? This guide gives you the three return measures every investor needs, and shows why the same double can be a triumph or a disappointment depending on one number: time.
Measure sealed returns three ways. Absolute return is the dollars you gained. ROI is that gain as a percentage of what you paid. CAGR, compound annual growth rate, converts the whole trip into a per-year rate so you can compare holdings of different lengths against each other and against other assets. A box that goes from $100 to $200 is a 100% ROI in every case, but it is a 41.4% annual rate over two years and a 7.2% annual rate over ten. Always compute your return on net proceeds after fees and shipping, from your true all-in cost basis, and sanity-check it against inflation before calling it a win.
Absolute return is the raw dollar gain: sell for $200 what you bought for $100 and the absolute return is $100. It is the number that pays bills, and the number that scales with position size, but it says nothing about how efficiently your money worked.
ROI, return on investment, divides the gain by your cost basis. The same trade is a 100% ROI whether the position was one box or one case, which is exactly why ROI exists: it strips out position size so different investments can be compared. What ROI does not strip out is time, and that omission is where most sealed investors fool themselves.
CAGR, compound annual growth rate, answers the question ROI ignores: what steady per-year rate would have produced this outcome? In plain English, it is the smoothed annual speed of your money. The formula is simple arithmetic: take ending value divided by starting value, raise it to the power of one over the number of years, and subtract one. CAGR is the only one of the three that lets you line a sealed box up against an index fund, a bond, or another box held for a different stretch, on equal footing.
ROI is a photograph; CAGR is a speedometer. A 100% ROI tells you where the trip ended. CAGR tells you how fast you were actually traveling, and speed is what compounds.
Here is the entire argument in one table. The purchase and sale prices below are illustrative round numbers chosen to make the arithmetic transparent; the CAGR column is exact math, not market data.
| Holding period | Path (illustrative) | Total ROI | CAGR |
|---|---|---|---|
| 2 years | $100 → $200 | 100% | 41.4% per year |
| 5 years | $100 → $200 | 100% | 14.9% per year |
| 10 years | $100 → $200 | 100% | 7.2% per year |
Same box, same double, three completely different investments. The two-year version is an exceptional outcome by any asset class's standard. The five-year version is strong. The ten-year version is respectable but ordinary, roughly in the neighborhood of what broad, boring, liquid index funds have historically delivered, without the storage shelf, the reprint risk, or the work of finding a buyer. None of these outcomes is bad. The point is that they are not the same outcome, and only CAGR can tell them apart.
This is also why holding period belongs in your plan before you buy, not after. A thesis that needs ten years to double should be priced and sized differently from one you expect to resolve in two. Time is not a detail of the return. Time is half of the return.
Every figure in the return math so far assumed you keep the sale price. You will not. Sealed product is a physical asset sold through marketplaces that charge for the privilege, and the exit costs come off the top of your gain, not off the headline price.
Walk through one illustrative exit. You bought a box for $100 all-in and it now sells for $200. A typical marketplace takes roughly 13% in combined fees, about $26 of your sale. Shipping a booster box safely, boxed, padded, and insured, might run another $14. Your net proceeds are around $160. Every number in this paragraph is illustrative, but the structure is not: the fee percentage applies to the full sale price, so the bigger the position, the bigger the toll.
Now rerun the return. Your gain is $60 on a $100 basis: a 60% ROI, not 100%. Over five years, the headline double was a 14.9% CAGR, but the net outcome is roughly a 9.9% annual rate. A third of the return in this example never existed; it belonged to the marketplace and the courier from the moment you decided to sell. Serious sealed investors quote their returns net, and they think in net when deciding whether a sale is worth making at all.
The same honesty applies at entry. Your cost basis is not the sticker price; it is price plus tax plus any shipping to reach you. Return math that starts from a flattering basis and ends at a gross sale price can overstate a real-world result by a wide margin.
One more honesty check, and it matters most for exactly the holding periods sealed investors favor. A dollar received ten years from now buys less than a dollar today, so long-hold returns must clear inflation before they count as gains in any real sense. The rough shortcut: subtract the average inflation rate from your CAGR to estimate the real annual return.
Run it on the slow double, with illustrative numbers. If inflation averages around 3% a year, the ten-year double's 7.2% CAGR is roughly a 4% real annual return, and the $200 you collect at the end buys about what $149 bought when you started. Your purchasing power rose by about half, not by double. The two-year double barely notices inflation; the ten-year double is substantially reshaped by it. This is not a reason to avoid long holds, which are where sealed scarcity does its best work. It is a reason to demand more from them: a thesis that projects a slow double from an already-expensive entry is projecting an ordinary outcome dressed as a spectacular one.
The live pair below makes the abstraction concrete. The first box is from a set released in 2019; its multiple over the $161.64 it originally retailed for is the kind of number that gets screenshotted. The second is a young Scarlet & Violet era box still early in its life.
Before envying the first card, do the discipline this guide teaches: divide by time. Team Up earned its multiple across many years of holding, storage, and patience, and its CAGR, while excellent, is a far smaller number than the raw multiple suggests. More importantly, that return belongs entirely to the people who bought early and held; buying it today at $12,961.00 is a brand-new investment whose future return starts from this price, not from MSRP. Meanwhile Surging Sparks at $302.24 has nearly all of its compounding, and nearly all of its risk, still ahead of it. Neither box is automatically the better buy. The lesson is that the spectacular chart belongs to the past, and your return will be computed from today's entry, over your holding period, net of your exit costs.
Every product card on the platform shows market price beside original MSRP, so the multiple that has already happened is always visible before you buy. A high multiple is a record of someone else's return. Your CAGR starts at today's price, which is why the platform anchors every signal to current price, not to the story of the climb.
1. Report all three numbers. Absolute dollars for reality, ROI for efficiency, CAGR for comparability. Any single one alone can mislead.
2. Divide every impressive multiple by its holding period. A double in two years and a double in ten are different investments wearing the same headline.
3. Compute returns net. Marketplace fees and shipping come off the top; a realistic exit can turn a 100% gross ROI into something closer to 60% (illustrative, but the direction is universal).
4. Your cost basis is all-in. Tax and inbound shipping at entry, fees and outbound shipping at exit. The market price is nobody's realized return.
5. Long holds must clear inflation. Subtract it from CAGR before judging a multi-year result, and demand more than an ordinary real return for taking on an illiquid, physical asset.
TCG Quant tracks supply, demand, pull rates, destruction, and Long-Term Scores across Pokemon and One Piece sealed product, updated daily.
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