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Grading Serperior #6 from Perfect Order isn't worth it at current prices. Raw copies trade around $0.16 while PSA 10s sell for about $93.85, a 4% Return on Grading. Grading and shipping fees would eat whatever margin is there.
Among the 53 cards in Perfect Order with PSA 10 sale data, Serperior ranks 6th for Return on Grading and 11th by PSA 10 price. Of the 4 Rare cards with PSA 10 sales, it is 3rd for Return on Grading. The median PSA 10 in this set sells for $49.00. 3 of the 53 clear a 100% Return on Grading.