Consider
Grading Voltorb (Roaring Skies) is a marginal call rather than an obvious one. Raw copies trade around $0.17 while PSA 10s sell for about $122.50, a 36% Return on Grading. A 9 instead of a 10 would likely wipe out the margin here, so be honest about condition.
Among the 43 cards in Roaring Skies with PSA 10 sale data, Voltorb ranks 31st for Return on Grading and 31st by PSA 10 price. Of the 5 Common cards with PSA 10 sales, it is 2nd for Return on Grading. The median PSA 10 in this set sells for $749.99. 28 of the 43 clear a 100% Return on Grading.
