How do libraries get their books? When was the last time that you checked out a book at your local library?
I've started going to the library more often(and using Libby for e-reading), they might not have the exact book I want, but there is always something I am interested in there.
https://www.npr.org/2022/08/18/1118289764/the-surprising-eco...
Libraries buy books, which are then covered by first sale doctrine. When a library book falls apart, the library may rebind it and continue lending it.