I have recently stopped listing on ebay, partly due to the poor support I have received when they have over charged me, and partly due to sales no longer paying my bills.
I have been listing on Ebid for quite some time now, even tho sales are low here. But as has already been mentioned, it is the buyers and a good buying experiance that is need here to keep the buyers here.
Regarding buying, I always check here first, then the tinternet, and last resort is ebay.