Hmmm, sellers reckon price too low, buyers say price to high - that's not ebay, that's human nature!
To me the biggest issue is getting fair and accurate descriptions, I suppose the feedback system goes someway to helping here, but sometimes it comes down to one man's Ming dynansty vase is another's busted teapot.
I reckon it saves a lot of machines going to the dump which has to be a good thing.
Another immeasurable benefit is that it gives us something to moan and complain about