My one negative feedback was retaliatory because I left a negative for the seller who sent the wrong item 1 month after I paid, and didn't respond to 5 messages in the next 4 weeks , so I will shed no tears about a seller not having the ability to leave negative feedback against a buyer.

The sellers brought that on themselves when they started the practice of buying feedback with their feedback a couple of years ago... They should have just earned their feedback the old fashioned way, with customer satisfaction... then they would still have negative feedback to use for real bad buyers and deadbeats instead of retaliation for bad feedback.

No loss in my book...

EDIT: I have only sold a couple of dozen times, but I posted positive feedback as soon as I shipped, every time.