I'd like to see a ranking table of highest overall feedback; it would be:
1) something for stat fans :-)
2) but also maybe to spur sellers on to list more items.
I bet some people would find it a nice challenge to try to top others' overall feedback ratings, so why not have an official table on show, perhaps the top 10 users or something?
Also, perhaps you could offer a little prize for the user who scores most ratings in a month - say, a couple of free front page listings or something like that; it needn't be big, just something worth having.
StartTheBiddingLow