I agree with you there. Imagine you would be at an actual market with a pile of your books and you would tell people they can take it with them and then later d

I agree with you there. Imagine you would be at an actual market with a pile of your books and you would tell people they can take it with them and then later decide if they want to give you a 'donation' for it. I would assume similar results can be seen. Also going in semantics.. Demanding a 'donation' is a contradiction.