Sounds like the same seller as I got conned with a while ago. He has obviously been duped by some low life in the past, and decided to take it out on the rest of us. I won a record that I'd been after for years, so he knew that I wasn't gonna tell him to shove it. 4.4% on a very expensive 45, and then I think he wanted $30 for the tracking postage. He knows that it's against the rules to ask for the paypal charges. That's why he doesn't put it in the listing. He waits until you've won the item, and then hits you with the hard luck story.
Like Mark said, once you give negitive feedback, you just get it back. Doesn't matter that you have done nothing wrong......Stinks.....