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SC<<And I must be missing something completely with this 10-12-15-20% bump issue. Why wouldn't it almost automatically be 50%. Shouldn't all cards graded 6 divide themselves roughly half and half between the top part of the range (6.5 - 7) and the bottom half (6 - 6.5)? It seems like they would almost have to.>>
Look at the average population reports on vintage cards. Let's say you have a card that is worth $40 in Ex/Exmt Raw, $50 in a 5, $100 in a 6, $300 in a 7, and $1000 in an 8. So it's not really worth it to get it graded hoping/expecting less than a 6 (i.e. elminate values under 5 because they wouldn't be submitted intentionally). Your pop report might be:
1-5 - 38%
6 - 50%
7 - 10%
8 - 2%
With the fact that the difference in population is exponential, with 7s 5x as tough as 6, and 8s 5x as tough as 7s - doesn't it make sense that maybe only 20% of the 6s will be good enough for 7s? In other words, a lot more of the 6s will be proverbial "6.1s" than "6.9s". Plus a number of the really high end 6s have already been bumped (to 7s). Basic elements of standard deviation.