About 75% of the books I read, I get from my local library and inter-library loan. I've also read that getting your book into libraries is difficult but a good goal to pursue, I assume because of the exposure [like songs on the radio].
I'm curious about whether the library pays more/less to buy their books than the general public, and whether the author is paid more/less for books sold to libraries.
I'm very glad to hear you're a devoted library user. I love libraries in general, and the libraries of my misspent youth in particular. The Seattle Public Library was where I discovered books that influence me to this day. Where I discovered the joy of escaping into a whole new world, and making friends with people very different than me. Sue Barton! Beany Malone! Homer Price! Misty of Chincoteague!
Even the small, woefully understocked school library in my sixth grade elementary school introduced me to Kon-Tiki by Thor Heyerdahl.
Libraries were where I first discovered Perry Mason, Hercule Poirot and Miss Marple. I had to depend on Christmas and birthdays for Nancy Drew since the library acquisitions team did not deign to include them.
Oddly, I don't have anywhere near the same devotion to bookstores that I do to libraries. I'm sure I must have been in bookstores when I was a kid (at the very least the University of Washington bookstore) but it is libraries I remember and love.
In other words, and perhaps more succinctly: Libraries Rock.
Oh wait, there was a question here wasn't there?
Let me get off my soapbox and answer it.
Libraries pay close to full retail for books. (Bookstores buy books at a bigger discount because they are re-selling them) Often libraries buy more than one copy of a book as well. Authors receive full royalty rates on books sold to libraries.
"Getting your book into libraries" isn't just a matter of luck. Librarians are very careful with their budgets, and their patrons' interests. They buy very carefully. Most often their purchases are review driven. Library Journal, Kirkus and PW are the go-to places. There's almost no way a single author can get his or her book into a library. The best avenue for that is to have library patrons request the book.
I'm not sure I've said this enough today: Libraries Rock.