eBay expects it's users to enforce the rules by grassing people up. Some of them are really miserable buggers though. One person grassed me up for posting a link in a forum asking if the auction was genuine or not. "It's against the rules to post links to auctions you're not currently bidding on".
The sad thing is there isn't really a good alternative to eBay, not as far as I know anyway, and I've managed to pick up some cheap computer hardware from there.
BTW. I'm selling links to a site telling you how to get a free iPod. Interested?