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The maths doesn't work on the Double Rare Armarouge ex from Paradox Rift right now. Raw copies trade around $0.89 while PSA 10s sell for about $23.00, a -75% 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, Armarouge ex ranks 103rd for Return on Grading and 103rd by PSA 10 price. Of the 17 Double Rare cards with PSA 10 sales, it is 10th 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.