alt Hacker NewsPublic libraries destroy unsold book donations all the time. I often tried to give away some old books I have online and nobody wants them. Some of these books have some nostalgic value to me so I hate to see them just get destroyed so they just lie in my shed.
I have a copy of Michael Abrash's Graphics Programming Black Book (it's like 1k+ pages) with DESTROY written in red on the sides. I appreciate that someone saved it and sold it to me for cheap :)