@ Rigger:
That's one of the problems with Ebay unfortunately. Your entire trading credibility rests on your feedback rating, and feedback ratings are left up to the individual who you're trading with - they're not regulated at all. So if you meet some kind of head case (and they are out there) and he wants to cause misery, he will. And that's the end of it, whether it's fair or not if he wants to leave you negative feedback for being denied "something for nothing" he will and there's nothing anyone will do about it.
I've been quite lucky with my sales. I always do my best to please and I have a feedback rating of 100% which reflects that, but it only takes for me to trade with one idiot and all of a sudden I could find my feedback rating irreprably scared. I did trade with one guy who filed for a non-paying Ebayer just because I wasn't able to pay immediately that day. I contacted him the day after the sale to arrange payment (I was going to use paypal) and he said he wasn't accepting it anymore and that he was filing for a non-payment strike against my account. I couldn't understand why he would want to do that, so I contacted Ebay and explained the situation but they wouldn't help me! Luckily the strikes don't affect feedback though.
Brian