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Posted By: peter chao

In general, people are more likely to get near mint cards and stars graded simply because there's a lot of money involved. But that's the same reasoning that justifies having the cards regraded on the off chance that they will get a better grade. Or simply keep having them regraded until you get a satisfactory grade. So these pop reports are not very accurate.

So the pop reports are probably totally inaccurate when it comes to commons.

Also, the pop reports are a relatively new developement. I'm not sure whether PSA and SGC kept track of the number of 8s and 9s before they had pop reports.

Peter C.