is not to let common sense desert you. Online auctions can be fun and there are some real bargains to be had but there are dangers. Don't send goods to people until you are certain that your purchaser has paid, and don't bid for items unless you are sure that you know what is for sale. That might seem like pretty elementary advice, but you would be surprised at how many people are taken in by the most transparent cons when it comes to online auctions.
Good old-fashioned greed has a lot to do with it.