Scarcity of the grade itself factors in a lot. I there are 50 PSA graded examples of a card, and 6 of those are a 4, but only 1 is a 5, and it's the highest, the premium will be huge. If, on the other hand, there were 50, and 10 were 4's, 10 were 5's, and another 6 were 6/7/8's, the premium would still be there, but far less.
It can sometimes work the other way as well, but more typically with newer cards. What I mean by that is if a 10 is achieveable, and there are 100's of 10's, the 9 is worthless, so the percentage of premium on the 10 is huge compared to the 9.
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****Southern League****
Old Mill (SL) PSA 3: 3/48
Old Mill (SL) PSA 4: 5/48
Hindu Brown: 1/34
****NY Highlanders Team Set****
Basic Team Set: 13/28
Master Team Set: 13/315
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