The stuff you see is the stuff for sale. That's it. Why are you assuming that everything that is out there is for sale? As Adam stated, the only conclusion you can draw is that out of the stuff for sale, 90% is graded.
Many, many cards out there in people's collections that is not for sale even with an offer on the table. Trust me. There are some cards I've been pestering people about that just aren't going to come out of their collections.
So, just because you see a catalog with cards in it or a table with cards on it or ebay with cards listed that are 90% graded doesn't mean that's all there is.
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