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The maths doesn't work on the Double Rare Froslass ex from Paradox Rift right now. The gap between the $0.74 raw price and the $5.00 PSA 10 price gives a -94% Return on Grading. Worth rechecking if the raw price drops or PSA 10 demand spikes.
Among the 112 cards in Paradox Rift with PSA 10 sale data, Froslass ex ranks 112th for Return on Grading and 112th by PSA 10 price. Of the 17 Double Rare cards with PSA 10 sales, it is 17th for Return on Grading. The median PSA 10 in this set sells for $68.25. 6 of the 112 clear a 100% Return on Grading.