Privacy is one. A lot of people don't carry cash, and probably few carry coins anymore. Which means going with electronic payment. Do you want there to be an

Privacy is one. A lot of people don't carry cash, and probably few carry coins anymore. Which means going with electronic payment. Do you want there to be an electronic record of every time you paid to use a restroom? Another is precedent. If charging for a restroom were allowed, it would likely be done in a lot of places that are currently free. That seems like a step backwards. A third is that if pay toilets were a big business, then such businesses would have a strong incentive to lobby their local governments against constructing new free bathrooms.