I would move like a shot
For a site with
1) Not so steep fees.
2) Does not put fees on postage rates (I add 20% to cover these!)
3) Does not down mark sellers for stupid buyers (had 5 in a couple of months could not read advert, title, nor the big imformation box in the middle)
4) Has a better search.
5) Does not make it unaffordable for the small seller of cheap items, (no profit on a 99p sale)
6) If there is a feedback system allow you to leave negative feedback for buyers.
I used to sell lots of crud on Ebay (old burger toys ect) for small amounts of money, now it is cheaper to charity bag the lot.
I still do a service on Ebay but not sold one in a week or two despite good feedback, market saturated by big sellers.