Some books just take time for people to realize how awesome they are. Look at the Hughes Supergirl Variant, or even the Black Cat Campbell craze going on now. Both those books could be had at one time for decent prices, now they're virtually tough to get anywhere at a decent price. I agree, this cover is fantastic. I stockpiled a few extras
More often Risk Takers are the ones who are rewarded later, not the safe bet IMHO. Look at Dredd Underbelly, my last 9.8 sold for $174, not many people graded that one, granted it was tough to get, but I'm still buying them for $30 any chance I get.