All his seller feedback is private auctions and a lot of people ask why. Some sound like they might have been timeshares, some sound like they weren't timeshares. Most, you can't tell. The feedback is plain cheese pizza. They could have sold comic books, cheap jewelry or cosmetics, or auto parts.
Legacy Adventures, mentioned in one feedback, is kind of hard to pin down. One hit in a Google search, Legacy Adventures, Inc., turns out to be Redemption and Release (Timeshare Redemption Services). If this is the ebay seller, we know how he gets his inventory. They purport to have an office in Richmond, VA and the street address is an office building.
I don't see anything that is damning or fatal, just cause for caution. I would ask a lot of questions. Don't fall in love with the property. Something as good or better will come along and there are ebay sellers with thousands of successful transactions.