Yeah, I do think that the GameWave console is likely something that a collector may be more interested just to HAVE it than to PLAY it. If I was a traditional conservative Christian mom or dad, then maybe I might want to get one of these for my kids.
I haven't done any research on it at all, but... I can think the one thing that would give me a
smidge of interest is if somehow the hardware was not copyright protected and homebrew hobbists happen to take to the system and putting out homebrew releases for it, giving it unintentional collector interest - like what happened to the

. I don't think anyone is likely to care enough about this system to go thru the trouble though.
If the GameWave starts showing up in retail clearance bins for almost nothing, (like what happened to the Hyperscan systems) then I might pick one up just to have one new pretty much just to have it.
In regards to obscure systems, John Hancock is the guy with that kind of stuff. If I recall, I think he told me he has a complete Nuon game set.
I don't really have anything obscure in my collection. I have stuff that is maybe kind of rare or harder to get, but nothing really obscure or unknown.
I've got a PC Engine, JVC X' Eye, Turbo Duo, Channel F as some of the more uncommon systems I have - but I wouldn't call any of those especially wierd or unknown. I'm sort of more of a game player than a game collector, so I don't usually go too out of my way for oddball stuff.