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The maths doesn't work on the Promo Quaxwell from Scarlet & Violet Black Star Promos right now. At $1.65 raw against $31.00 for a PSA 10, that works out to -66% ROG. 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, Quaxwell ranks 19th for Return on Grading and 19th by PSA 10 price. Of the 25 Promo cards with PSA 10 sales, it is 19th 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.
