Well, turns out I was entirely wrong OP- please ignore me and listen to the sellers with bigger numbers next to their names 🙂

It doesn't seem very sporting to list an item with "For XXX only- Nobody Else!"... it's probably the closest you can get to trading outside of ebay w/out trading outside of ebay, but if it works then great.

True, the 2nd buyer didn't read the listing properly, but I wonder how you'll get away without exasperating them/copping a defect.

Very interesting!