Perhaps there should be some weight parameter added to both positive and negative feedback, where the value of the sale is being compared to total sold goods va

Perhaps there should be some weight parameter added to both positive and negative feedback, where the value of the sale is being compared to total sold goods value makes the feedback more or less relevant: if you're mostly dealing with expensive laptops, and then you've sold broken pair of cheap headphones, then it should matter less, than when you're selling cheap headphones and you've sold broken expensive laptop. This is from top of my head, but I bet there are many other ways to improve rather old, and no more ideal eBay feedback system.