My guess would be a compatibility issue of some sorts. There is a game somewhere that possibly behaves best on windows XP/DX9/nvidia. The fact that there are multiple ones going for that price might suggest that people are hoarding them though. Odd indeed.
perhaps they contain a chip that can block NSA snooping....
I think you just figured out how to sell everything on eBay for 3 to 100 times what it's actually worth. Just claim it will block the NSA with a small disclaimer at the end saying the statement has not been approved by the NSA. 😉