Couple of points
1) It's 3D0 hardware, even if it was dumped, neither MAME nor MESS has 3D0 support capable of running games yet and it might be some time before they do, if ever. (Lack of active developers etc.)
2) While the DU will go for rare boards, they also won't be held for ransom. A couple of sellers are doing this as of late, severely overpricing undumped games, clones and revisions, even if they're not THAT rare. The DU simply don't bother, the majority of things will show up again, and as I've already stated, there isn't even the dev team available to emulate beyond the simplest of new dumps.
3) It's allegedly barely complete as a game anyway, just a couple of (bad) minigames thrown together, it's a prototype for a reason, and probably not much fun even if you do own it.
4) It's probably dumped (in some form) somewhere by somebody anyway, the majority of Atari protos are.
5) If it's a CD, that could be even more annoying, there are ongoing arguments still about the dumping quality / accuracy of CDs even for simply systems, nevermind something that's not yet emulated.
There are, in all honesty, more important things to sort out.