In the US, I always resented paying to use a restroom. It’s not that I love it when we travel but I do have a better appreciation since I saw a sign that said that the money was used for maintaining the restroom. Another sign said that you were “renting” the restroom.
It isn’t expensive, just inconvenient sometimes to have change. It is usually $0.50 or less. I remember that the bus station at Turrialba is 150 colones which is about $0.26. (The cents sign in the image above indicates “Colones” the money unit in Costa Rica.)
Don’t forget to keep toilet paper with you when you travel since it is sometimes a rude surprise to not have any. One place I went in didn’t have any dispensers in the stall but then (after I finished my business, fortunately I was prepared), I saw the dispenser on the wall outside the stalls. That seemed a bit odd since it might lead to taking more than you might actually need…just in case!
In many of the places where you pay, the attendant gives you a premeasured amount of paper before you go in. Not wild about the idea of someone handling my paper before I do but again, it is often much more than I need so it is wasteful.