I like your Ebay feedback ideas. Ebay feedback is a joke. Bad sellers intentionally hold back feedback so that they can retalitate against a buyer who did absolutely everything right! So buyer dont post anything, this makes Ebays feedback system crap.
I also know about the site that rates peoples appearence and you are right, no one is below a 5, but if it makes you feel any better I have rated on it and I rated many below 5!