Well, as has been stated about ten thousand times on this forum, just because someone payed $300 for something on eBay doesn't mean anyone else ever has or will again.
I'm not a price watcher, but I sorta know what's going on, and IIRC Drac X was, random idiocy aside, a sub $100 game from its inception until the current collectard boom, the last eight years max, probably the last three.