A seller using a different account to enter bids on his own stuff (to determine max bids) is clearly violating
ebay policy. It is against the rules to bid on your own stuff. Sometimes they get caught, warned and suspended. Sometimes they don't.
Entering bids and making last minute bid retractions is a huge red flag. Bidders with excessive bid retractions are deliberately entering bids to uncover the max bid. Once they find the max they retract the bids and wait until the end of the auction and 'snipe' the item with a last second bid.
I've caught several bidders at this game over the years and have quietly blocked them before the auction ends. I have received several hateful emails and Neg threats after blocking them. They all have one thing in common.... They all lie about the reasons for the bid retractions. My favorite was the guy that claimed his number "0" key was sticking! His number of bid retractions so far that year was 169 times! I caught one guy using two separate ID's. When he found the first ID was blocked he used his second ID to "win" the item. I reported him to
ebay and both ID's were NARU'd.
ebay hides more and more stuff the last few years and makes it harder see what is going on. Whenever I get a bid retraction email that bidder automatically gets on my BBL.
ebay has ways to catch them. If you suspect you have been victimized you can report the suspicious seller and suspicious bidder(s) using the "Contact Us" linky at the bottom on most any
ebay page. They will investigate and start watching them.