I don't understand the rating system on eBay. But I now understand why it works the way it works. You can't really give other than positive feedback. If you try you risk getting slammed by sellers. I saw someone complaining that he got the things he bought in a flimsy envelope that just barely kept together during transport. So the poor sod gave a neutral feedback - to be slammed with a negative by the seller backed by the community when complaining. If one can't give anything but positive feedback without risking one's reputation on eBay - the system is flawed. But now I understand the mechanisms.