It must vary considerably by set, right? There are probably a few Just So's laying about in grandpa's attic, but given how expensive they are, surely almost all that have turned up have been graded. Right?
Or to take a less extreme example. PSA and SGC together have graded about 275 copies of the N28 Clarkson. (No doubt with some resubmissions in there too.) An ebay search turns up four for sale, three graded and one raw. If only 10% of them had been graded, and there were 2000 odd raw N28 Clarksons out there, surely more than 25% of those for sale on ebay would be raw.
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