I used to collect books, and then I donated them to the library. Now, I have more space, they keep track of them for me, and I can check them out whenever I want.
Them not taking them wasn't so bad. I was more annoyed by the attitude of the staff who made a big song and dance as if they were doing me a favour by even considering taking free books.
A library accepting free books in good condition seemed like a no brainer to me :|