You can't use ebay as a value guide at all. That $995 Motorace on ebay is a dealer's price (I know the dealer too, nice guy, I have sold him machines in the past, he gives fair prices). That $995 one probably wouldn't go much above $200 at a public auction or on craigslist.
The one you linked is some sort of weird conversion in a Centuri cabinet. It was probably also gone within 15 minutes of being posted.