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The maths doesn't work on Ponyta #16 from Steam Siege right now. At $0.19 raw against $99.99 for a PSA 10, that works out to 11% ROG. Worth rechecking if the raw price drops or PSA 10 demand spikes.
Among the 34 cards in Steam Siege with PSA 10 sale data, Ponyta ranks 32nd for Return on Grading and 32nd by PSA 10 price. The median PSA 10 in this set sells for $250.00. 22 of the 34 clear a 100% Return on Grading.
