I still buy paper books because I can find them for next to nothing at yard sales and I can legally be the first, tenth, or hundredth owner of that precise copy. I even get/give books for free at book swap meet-ups.
E-books have not replaced the tree-pulp kind, but have just added to the ways I can read books.
I almost never buy books at full price. A book I want goes on a wish list, and I'll buy it when I see it on sale, or refer to that list if I see a pile of books at a yard sale or library discard sale. (where I can buy books for pocket change).
I live at a time where, with e-books being all the rage, I can obtain printed books for nearly nothing, then without a thought can just pass them on when done. The
bookcrossing philosophy remains alive and well as the world being one giant library.