Have to say, I'm disappointed that what started as a question about Flippa quickly devolved into an issue about my gender and insults among forum members. I like chiming in on forums when I can have an actual conversation and be helpful, but I'm not sure either is happening now. And on a Friday afternoon, too!
Jonathan -- sure, let's talk about shill bidding. There's obviously an information imbalance, since I have admin privileges on the site and can see communications between users and user histories in order to identify shill bids.
When shill bidding occurs -- and it's a much rarer occurrence now than it was even a few weeks ago, when we introduced mandatory credit card verification for all bids over $200 -- and we have any way at all to trace it, that's indicated on the listing with a red "possible shill bidding" alert.
Now -- we're not mind readers. We have watch lists, and we observe user behaviour, but we can't be across all listings at all times. That's why we ask users to notify us if they notice anything, either by reporting the listing (on the main listing page, above the comments) or by emailing us at
support@flippa.com
Why do you mention the Buy It Now price? That's simply the maximum amount a seller hopes to get for their site, and it's irrelevant to shill bidding. What matters in these cases is the reserve, which three of the listings you link to haven't even met.
In each case you've listed, you would probably deem the highest current bid a "shill bidder". So what happens when the listing ends at or above reserve and one of these accounts wins? The seller is out $29 for their antics, and their own sales rate goes down. That's it.
The rate at which shill bids bring a listing above the reserve, and a legitimate bidder ends up paying more for the auction than they would have otherwise, is very small.
Small incremental bids aren't unusual under a few hundred dollars. Unless you're saying that all low-end sites are run by shill bidders or, in your words, "criminals from the 3rd world", you have to accept that everyone wants to pay as little as possible for a piece of web property. For low-end auctions, that means placing $5 bids one at a time.
Does shill bidding happen on Flippa? Sometimes, yes. My point is that it has a small effect on our users, and that it's happening less and less often.
Once again, you have my email if you have specific issues about your own account. I'll be happy to take a look.