Seriously, just send an e-mail off to e-bay's complaint department, and send the user bad feedback, they may even have a 'report bad auction' button somewhere. People that do that bypass e-bay's percentage on auctions and they go after them like rabid dogs. I don't care what the users reason for trying to bypass the minor charge is but it's dishonest, and that's not someone you generally want to do buisness with anyways.
If they are dishonest posting the auction, how much confidence do you have in the item or seller? Ebay should force them to honor their comittment or ban them. Laptop for $25? Seems like they should have caught that...
No, your not allowed to do that! I have been selling on eBay for a few years now... dont bid with this seller! Report them if you are feeling like a Vigilante.