I believe aquabid is much like ebay.The site is not responsible for the individuals who use it,although repeated abuse would not be tolerated.The best course is to read the auction terms carefully before bidding and check the feedback rating of any seller you plan to buy from.I see a lot of sellers with long term business and 100% positive (or close) feedback.I am watching for fish that have reasonable and easily understood shipping terms.I even see some that offer free shipping.Haven't bid yet but I will eventually.
HTH
Koda