I have an eBay store for my POP ART listings, and now I will be rethinking whether or not it'll be worth it with the new fee structure for fixed priced listings, which all of mine are. I guess we shall see. The only advantage that I liked was I could offer several auctions for 30 days and several quantity for 3¢, but obviously you can't solely use your store because you won't get any exposure to it. You need regular auctions outside of your store so you can be searched and hope that people will peruse your store. Otherwise, it isn't worth it.
I guess it all depends on what you're selling, too. Lots to think about before the changes in Sept.