>> "Say you need to buy items from 10 different stores. I would rather use a service that goes to 10 different stores for me, than have myself drive to each store to hunt down each item."

I guess it depends how you shop! :) Supermarkets are there to give you the lowest prices and eliminate the need to go to more than 1 store. But I understand where you're coming from. I guess we'll have to wait and see how it works out.