I think what doesn't help much is that the Hound and Ravage mold were only made available the one time (at domestic retail). There were no second chances unlike Sunstreaker/Sideswipe/Red Alert, Prowl/Bluestreak/Smokescreen, Ironhide/Ratchet, and so on.
The rest of the figures from the Universe 2.0 line that only came out once didn't seem to have the demand (likely because they weren't labelled as "great" figures - Galvatron, Tankor, Hot Shot, etc) that Hound did.
That said, it's hard to believe that it's going for so much on the secondary market...