It's not just the PSA 9s that are moving, but PSA 8s too. I own both in 8 and have tracked eBay sales for the last 5 years:
1973 Topps #615 Mike Schmidt RC PSA 8
Year Avg. Winning Bid (number of auctions)
2009 $208.41 (11)
2010 $226.98 (37)
2011 $252.28 (40)
2012 $265.80 (59)
2013 $313.67 (40)
1975 Topps #228 George Brett RC PSA 8
2009 $ 92.56 (13)
2010 $103.56 (64)
2011 $120.75 (14)
2012 $146.56 (76)
2013 $183.89 (80)
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