I wonder if there is some dude that collects 3rd party shit like Pelican memory cards. There probably is. In the past I always though collectors mainly liked high quality, usually 1st party/official releases more than anything. Usually exciting stuff, imports, hardcore genre releases, etc...
Then I started hanging out around here and found out people were paying $100 for shitty HuCard adaptors. Anything is possible, I guess. I also know of a guy that collects PS2 games. Not rare, interesting, import PS2 games, just average everyday US release PS2 games. He doesn't really give a shit what they are, just that they cost less than $20. That's pretty unexciting, IMO. To have a huge pile of hundreds of sports games and Quake clones.
I'd pay good money for a copy of Terrifying 911 for GBC.