Grading decisions get made on the upside and regretted on the odds. The right way to run the number is expected value: multiply each realistic grade outcome by its value, weight it by how likely it is, then subtract every cost of getting there.
The full cost stack
- Grading fee per card at your chosen service level.
- Shipping both ways, plus insurance at declared value.
- Time — months of capital tied up, during which the raw market can move against you.
- Selling costs on the other side, which on most platforms is a double-digit percentage.
The probability part
Be honest about your gem rate. For modern cards pulled from a pack and sleeved immediately, a realistic 10 rate on a well-centered card is far below what enthusiasm suggests. Centering is the killer: a card that looks clean to the eye but sits at 60/40 is a 9, and a 9 on a modern chase is often barely above raw.
A worked example
Take a raw single at $65 where a 10 sells for roughly $640 and a 9 sells for roughly $110. Assume a 25% chance of a 10, 55% of a 9, and 20% of something below. Expected sale is about $250 before costs. Take out grading, two-way shipping and selling fees and you are still comfortably ahead of $65 — this one grades. Now run the same set of odds on a card where the 10 sells for $120: the expected value collapses below the cost of the attempt.
Grade the spread, not the card. If the 9 and the 10 are close in price, there is no trade there.
We show the raw versus PSA 9 versus PSA 10 estimate and the net upside after costs directly on every raw single we list, so you can run this in about ten seconds instead of ten minutes.
