I don't have access to all the PSA population numbers, but a good basketball card example that I feel is being manipulated is the Skybox E-X2000 #30 of Kobe from 1996-1997. When I was trying to buy one, there were 23 PSA10's and 682 PSA 9's. This card should not be that rare in high grade. And the difference in price between a 10 and a 9 is now astronomical. VCP lists the PSA 9 current average sales price as $1134 while the PSA 10 is $22,625. This is due primarily to the low population and desirability of that card in a 10.
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