Unfortunately I have had the same "Buy it Now" issues so eBay gave me a couple of good suggestions in Seller Preferences---I now require a buyer to be PayPal approved and to not have a Negative rating in order to bid on one of my listings.

I only wish eBay allowed you to not allow buyers with ratings under a +2 or some rating like that to require "prior approval" to bid. There are too many bidders that will buy a $1 item and get a quick Positive rating and then start to scam.

Since I have installed the "PayPal approved", I haven't had problems. Most scammers aren't going thru the trouble of getting PayPal approved---at least I hope.

Just some suggestions--hope they help.

Andrew