Skip For Now
Grading Koraidon ex #245 from Paldean Fates isn't worth it at current prices. A 4% Return on Grading comes from the spread between $12.25 raw and $106.37 graded. Worth rechecking if the raw price drops or PSA 10 demand spikes.
Most grading maths asks you to guess your odds of a PSA 10 first. This works backwards from the prices instead and tells you what those odds would have to be.
The number is different on every card. It's how confident you'd need to be that this copy gems before grading pays for itself, so 20% means roughly a 1 in 5 shot and 50% means a coin flip.
Grade it if you rate your copy better than that, leave it raw if you don't.
It assumes a 9 is the worst you'll get. Centering and edge whitening send plenty of modern cards back at 8 or lower, and that's not priced in here, so treat this as the floor of the bar rather than the whole of it. Selling fees aren't counted either.
(cost - PSA 9) ÷ (PSA 10 - PSA 9)
You need at least
a copy you'd bet on gemming almost every time for this to pay off.
You'd be risking $81.44 to make $4.12, so the 10 has to be close to certain before this is worth doing.
Among the 174 cards in Paldean Fates with PSA 10 sale data, Koraidon ex ranks 61st for Return on Grading and 56th by PSA 10 price. Of the 6 Hyper Rare cards with PSA 10 sales, it is 3rd for Return on Grading. The median PSA 10 in this set sells for $75.43. 16 of the 174 clear a 100% Return on Grading.
