I would say that it would be based more on the value and desirability of the raw card. Vintage HOF rookie cards and other iconic high demand cards are going to see a return on raw almost all the way to 1. With lesser demand star cards I don't know that you turn a profit by grading but it will probably sell faster. Then with commons even if you pop a 10 it is likely only going to be valued by the most obsessive of set builders/registry nuts.
On caveat I would say is if you have a card with great centering/eye appeal but contains a significant technical flaw that will reduced its grade don't grade it. Sell it raw with ful disclosure of the issues.
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Personal Collection Magic Number: 29
Collecting Hall of Famers and players with Nebraska connections.
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