> They claim that both buyers and sellers are their customers, unlike an actual store where only the buyers are the customers.

The garden department at your local department (Wal-Mart does this. So do most home repair places) store is operated by another company. So too is the salty snack aisle, soft drink aisle and many other departments where an outside vendor is basically renting shelf space, and paying the rent in margin at the register. In all of these cases, the store also has a house brand that is in the same aisle, competing with the big brands. So, what Amazon is doing is really the same, but in an ecommerce format. BTW, department and grocery stores were running their own logistics company long before Amazon even existed.