I love shows like Pawn Stars, American Pickers and Storage Wars.
There's also:
Auction Hunters - kind of a like Storage Wars but the show only follows a team of two guys.
Hardcore Pawn - This follows a more traditional pawn shop in Detroit than the one Rick runs in Vegas. People try to pawn/sell jewelry and PS3 not Picassos. (Also a lot of the customers act crazy, I guess some people will do anything to get on camera.)
Oddities - follows an antique shop that deals in strange and creepy stuff. This is probably the show that would appeal most to horror fans.
Auction Kings - follows an auction house. This show does have some objects that would appeal to horror fans, like they try to auction off an old Ouija Board and an authentic Vampire Hunters case.
Here's a link to the scene from the show about the Vampire Hunting kit:
http://dsc.discovery.com/videos/auct...lling-kit.html