I've seen your auctions, some very rare games there I'm sure you've had message from all the usual eBay suspects offering you cash offers.
I even had a guy on eBay send me a message as he'd noticed me buy a particular rare Game on Amibay and he wanted to buy it off me! Cheeky git...
These guys will try and get them cheap from you and relist them at silly BIN prices, let the auctions run and I think you will be surprised what some sell for
All the best,
Steve.