I'm selling an item on Ebay and have my doubts about the current high bidder. They have a very generic bidder id and only a (1) for history rating (from 3 years ago). They've also bid many times in small increments on the item. I sent them an email with an easy "prove you're not a computer" question. Hopefully, I hear back, but what would you guys recommend if I don't? I've never had to cancel someone's bid, but I want to make sure the REAL people bidding have their chance to win.