JeremyR
As a librarian, I can tell you that libraries pay royalties to the author for each time a book is borrowed; just like radio stations pay each time a track is put to air ; and most authors love having their books in libraries because it means they get some exposure they might not otherwise. Library borrowers will borrow a book by an author they don't know, enjoy it, and then maybe become a fan and start buying them or giving them as gifts. If they have to risk spending their own money on an unknown most people don't. Hope that sheds some light on how libraries help authors