Part of it is that for the most part PSA now has incredibly strict grading standards. Today's 7 is yesterday's 8. I have seen 5s and 6s that are NM to the eye and almost certainly would have graded higher in years past. So in a sense it's not apples to apples, as SGC grading seems to have stayed more consistent.
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Net 54-- the discussion board where people resent discussions. 
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