Retracting a bid on e-bay is a pretty complicated process that involves humans. If someone were to do that twice in a week it would raise flags, twice in a day? ban-hammer.
No, what folks do is create a shill account with the purpose of bidding up their auctions. Sometimes they are smart enough to have several, sometimes they make a new one for each 'group' of auctions.
But you can see the pattern.
Legitimate person puts in bid.
Shill bids in small amounts until they *just* pass the bid.
Another legitimate bid is entered by someone. same pattern.
repeat until the last few hours of their auction, or until they get to a price point they feel comfortable with.
If you see this pattern, you can click on the bid list then the bidder. [Ignoring screen scrapers, or ripping apart the HTML during pre-render events etc.] You can immediately see the number of times they have bid in the last 30 days, if they are a new user, and more importantly .. the % of auctions they have taken part with for this seller.
If someone has 15 bids in the last 30 days, 3-4 of them on this item, and 80%+ with this seller? *AND* is a brand new account?
It is suspicion worthy.
If those same auctions all have that new bidder, and they have never WON a single auction (and are always the second to the last bidder) *AND* all of the auctions are at, or higher than current store prices. It is a shill account 99% of the time.
People just don't *bid* that way. You would have to be baby-sitting auctions constantly, and bidding multiple times, in small increments, over DAYS to effect this pattern. Always losing? In the end of the day, who - aside from the seller - has THAT much interest in auctions from *only* one seller?
Ebay doesn't do much about it, because its a dickens to actually 'trap' someone doing it. Additionally, they benefit from both higher sale prices due to percentage, and because it reinforces the idea that people will get high $ sales if they sell on Ebay.
I used to 1099 with Bill Me Later, and there was a lot of work put in to analyze bidding patterns against items for prediction of fraudulent charges [with an eye towards money laundering, not shill bidding] before the company was bought.
it is fascinating stuff.
I used to be an industry professional responsible for making sure Japan was able to buy some of the best toy soldiers ever made.
Now I'm just an old gamer
www.TrueDungeonTokens.com