Ergo's had a small cult following but never really made the big time like Kyosho's and Miniature Aircraft for whatever reason.
You have something like a car that's rare, but nobody really is enamored with. The right person see's it and you're in luck, but the masses probably aren't going to be too excited.
Try it in the classifieds on RunRyder and mention in the antique forum that you're selling it.