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The maths doesn't work on Koraidon from Scarlet & Violet Black Star Promos right now. The gap between the $52.81 raw price and the $9.99 PSA 10 price gives a -93% Return on Grading. Hold it raw and watch for the graded price to move.
Among the 25 cards in Scarlet & Violet Black Star Promos with PSA 10 sale data, Koraidon ranks 25th for Return on Grading and 25th by PSA 10 price. Of the 25 Promo cards with PSA 10 sales, it is 25th for Return on Grading. The median PSA 10 in this set sells for $60.00. 5 of the 25 clear a 100% Return on Grading.
