I don't know what to call it, but I had an item on ebay (I just don't learn.) At auction's end I see the high bidder has zero feedback and joined ebay that day (just great!) I send the invoice and shortly after I send a note to the next highest bidder letting them know that the high bidder would probably not go through with it and I would offer it to him if it didn't pan out.
Later I get an email from the "winner" saying "I didn't realize my bids were automatic and that I was accidentally bidding against my husband. I can't afford that, can you give me a discount?" The ending price was 276.00. The second high bidder was pretty close but wrote back " Sorry, we didn't know we were bidding against each other. I'll give you a hundred dollars for it."
So they bid the auction way up so they could secure the item and then tried to cut my throat. I reported them and blocked them. I would love to beat them with a shovel.