$1000 for a copy is quite generous. Jamm wasn't looking for the original.
I think part of it is that the owners assume that releasing the ROM makes their prototype worthless. Not usually the case, but if it was, to the seller, selling the original or selling a copy might make little difference.
Let's be honest, most of the community probably just wants the
contents of that prototype. Any of us can burn it and make a nice case/cover for it for a couple bucks.
If there is a price that the PC Cocoron owner would agree to (for a rip/copy), we could all contribute to the pot, that is if the number is feasible. It would be crazy and silly, but our purchase would go down in the gaming community history books!
I'm sure there are plenty here (myself included) who would chip in to see this released. I've been reading about this one probably since I joined this forum.
EDIT to add: According to
this post from back in 2004, this thing has been eluding us for a long time...