I don't think it is crazy. Games are worth whatever people are willing to pay for them.
Unfortunately it does make life difficult.
That, and the ****ing traders. These are people who do not care about the games, just buy bulk auctions in order to re-list as individual items.
Kinda kills the aim of eBay IMO - no middle man? I wish!
Anyone looked at Atari ST auctions? Games are incredibly cheap compared to Amiga games, even original Infocom titles!