I really don't know. There's another 8.5 copy at the current CC copy, but not as nice looking due to that black writing on the "X". I guess we shall see where that copy sells at? All i know is that strong eye appeal books sell for a premium, sometimes more than a higher graded one. Looks like it is becoming the norm now as more and more people are taking notice unlike in previous years.
But in the last HA Sunday auction, I noticed quite a few record prices. The FF 1 CGC 3.5 sold for around $8500, the Hulk 1 CGC 3.5 UK copy sold for around $9500, which is about where a US 3.5 copy sells for, and of course another X-Men 1 CGC 5.0 for $6k+. New market prices? Looks like SA keys are catching fire.