What I have found more amazing is the selection of books in Amazon "brick-and-mortar" bookstore compared to Barnes & Noble (B&N) bookstore in same Seattle shopping complex previously. I typically visit that shopping complex few times a month. Every time, I have visited Amazon bookstore, I tend to pickup couple of books to browse that I find interesting. When I used to visit B&N in same complex previously, it was rare for me to pickup books to browse in repeat visits. Amazon is able to achieve in 1/4th of the one floor what B&N couldn't do with books on two floors, make me pick up books on repeat visits. Amazon seems to refresh books more often in its store. Amazon might also be using the browsing/purchasing habits of users living in the area to determine what books to stock at the store.