Yeah, that's really fun to read but damn reality there. Also if they automatically charge 20 cents people think it's unnecessary and if they ask, we out of guilt may be pay but again avoid to go there. Because it's like either way pressuring us. Humans don't like pressure either way even for a good cause.
Instead of it they should have a box like for donations for plantations, may wrapped with a posters showing their work. May be regular people who goes there donate once per two weeks or like month more than 2-3 $ to encourage their work.