Yes, this happened all the time with sellers leaving revenge feedback but something needs to be in place to keep both buyers and sellers in check. Before, when you could leave negative feedback for buyers whenever I used to sell on ebay, I would hardly ever get buyers that didn't pay. As soon as the rules changed, I had four buyers out of seven listings that did not pay. I haven't sold on ebay since. It's been years and years since I've sold anything on ebay. I might sell something but it won't be worth a lot.