I'm not defending chattanooga pinball, but that CL listing does say that his machine(s) have issues, and they don't look to be in quite as nice a shape as the ebay listing, but they don't seem to be 1200 worse by any stretch.
I got 650 for my Cyber Sled machine, which is somewhat similar to VirtualOn, but my cab was in great shape and working 100%. It did take a while to sell though.