eBay is a advertising site these days. Same machines, with the same inflated price tags from the usual suspects. When games are relisted over and over, buyers lose confidence in the seller as their stock does not move.
I'm not sure what the recent Embryon was sold for (as it was pulled), but a customer / friend of mine was willing to pay over $2500, and another - $3000.
eBay have created this situation with their fee structure.
Add to that some of the turkey's who buy on eBay and it's no wonder why these listings get pulled