If you read Bill Cobb's (eBay CEO) letter for this years change...
He stated that very soon, store inventory items will begin showing on EVERY search done in eBay. This is being implimented in direct response to Seller's complaints about not getting enough coverage on their Store Inventory Items.
This spring, the new eBayExpress website will launch which basically will play host to Store Inventory items for Seller's who have 100+ feedbacks and at least 98% feedback rating. EbayExpress will be a seperate site designed around a standard eCommerce Website...shopping cart in all.
I have an eBay store, and it more than Pays for itself. I hold between 100-200 items in store inventory, and plenty of them sell (at .03 cents per listing fees!). It's more than worth it, in my opinion, plus, these new things eBay has going on are promising.