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T206CollectorThese are two SGC 88 Auction Prices (the equivalent of PSA 8). In the June Goodwin auction, a Killian portrait SGC 88 sold for $4,200.73. In the same auction (Goodwin) in October, an SGC 88 Dineen sold for $1,485.20. Now that is some difference, notwithstanding that the Killian portrait is a nicer card visually.
If someone with VIP membership to VintageCardPrices.com wouldn't mind posting the history of PSA 8 sales for 2006, that would be interesting to read -- and much more persuasive than the standard Jim Crandall PSA 8 promotion.