I seem to remember this being mentioned before, and I for one would be interested. Setting up one on eBay would cost money, and may not pay out, which would be annoying if you wanted lots of items for sale. All we really need is a kind of 'shop' account, and auctions that keep resubmitting themselves automatically, and perhap the ability to add our own categories under our shops.
Any chance of this being implemented? :O)