There is “bidding up” which is something one may do to be mean, or there is “shill bidding”, in a live auction, one may have somebody that they “know” in the audience bidding up items to make the final price high. On Ebay, cases of “shill bidding” discovered, was for example, as seller listed some sports cards, I believe, and then started bidding against somebody on his own auction under another user id. Somebody got suspicious, since the location of the user id’s was the same, and both user id’s sold sports cards, I think. An investigation was done, and it was true. He claimed he was afraid of not getting a profit, so he “had” to do it–unfortunately, he was a power-seller, so he got not much more than a slap on the wrist, a 2 week suspension, and back in business again! 👿