This is a good test but the cards have to be sent in by someone that rarely submits cards. Getting in on a group sub on this forum by Bobby would also work.
Pick 10 random #s between 1 and 30. Then go to 4SCs ebay page and search for PSA 10s. Now list them from cheapest to most expensive. Now take those 10 random #s and buy the 10 cards in order on 4SCs ebay listings. Crack them out and send them in and see how many come back as PSA 10s.
