We are talking about book stores, meaning there is a desire to own the book being read. You don't get to own the books in a library. As someone who heavily annotates my books—except fiction—I will need to own a physical copy (or a digital edition). I haven't been to a book store in a while, but I recall the last two times being quite disappointing. Meanwhile, on Amazon, or other online providers, I can find what I need more often than not.