Of course it's ethical! I love second hand books. What's one supposed to do with books when you've read them and know you're not going to re-read them? Give them away so they can be re-sold. People earn their living from it, and others can read books they otherwise couldn't afford.

Just when you thought they couldn't fall any lower

I read a very interesting article the other day, that that is the idea... Frightening times we're living.
open.substack.com/pub/malcolmn...