eBay feedback system is a joke. I got my only negative from a person that ripped me off!!! The fact that some buyers/sellers hold their feedback as a recourse for legitimate bad feedback.
In my case, I paid for the item with PayPal on the day the auction closed. After a month and a half the seller still hadn't shipped my items and was holding my money ransome demanding additional shipping money (more than the previously agreed on cost and what was listed as the flat rate in the auction). I asked for my money back several times with no response from the seller. After giving up hope I filed a claim with Paypal, SafeHarbor and gave her a negative. Of course, I instantly got negative feedback in return. :pissed: