Just in case you're not familiar with it, the reason there's a regulation against it is that a group of kids with the belief you're espousing lobbied for that regulation. They formed the Committee to End Pay Toilets in America. I suspect if there is a norm against this here in the US it was created around the time of that law.

https://en.wikipedia.org/wiki/Committee_to_End_Pay_Toilets_i...