With buyers only being allowed to receive positive feedbacks, they'll be a lot faster to leave a negative (deserved or underserved) without fear of retaliation. That's absolutely ridiculous and completely unfair. If they pay the day before an unpaid item dispute is closed (like 13 days after the auction ended), they can leave negative but the seller can't leave one back and say "TOOK FOREVER TO PAY"? Problem buyers will think "The seller can't do anything to me anyway." What is ebay smoking?