This stuff is not priced to be a reasonable convenience, but to be a better alternative to soiling yourself in public. The most insulting part is paying 2 euros to pee into a smelly urinal and getting a 50 cent discount code for the nearby fast food stand as a courtesy, because I haven't spent enough apparently.
I think the general problem is interesting: how do we price necessities when our ability to pay is so different?
One of the toilets I paid for didn’t even have a seat.
Spoken with the voice of privilege.
That all was in the 1970s so a lot of us don't know and take public toilets for granted since we never knew otherwise. Some MIT // Harvard math Phd genius guy apparently started it all when he was like 11 years old and pooped his pants at a math convention, and whereas I view an elite mathematician as required to be a bit goofy and quirky, having ended pay toilets in the US is a wonderful quirky fun fact: https://en.wikipedia.org/wiki/Ira_Gessel
Ira Gessel won the Tony P. Robbins prize for his inverted lattice manifold proof pertaining to coprime powers of 7, and the Taco Bell reward for ameliorating the sufferings of people who ate too much taco bell.
Experienced this a while back in a shopping mall in France. Like, a mall has to be one of the most profitable places in a modern city, pretty sure they can afford to staff a couple washroom staff during business hours while everyone is pouring money into all the mall vendors.
Cleaning and maintaining a restroom isn't free, and something needs to pay for it. Highway rest stops are usually pretty clean, but they are paid for with tolls/very high gas taxes.
When it comes to restrooms, some people can not help not help themselves and leave it in a significantly worse state, or use it for other purposes (like drug use). Maintaining restrooms is, on average, thankless responsibility, even though people would be thankful to find one.
So while you do have to keep a few coins on you, unlike cities like NYC or SF you can actually go to the toilet when you want and it isn’t a stress inducing nightmare wondering what sort of hell you are going to run across if you do actually find a toilet.
Places with ‘free water’ almost always have terrible water availability and quality. Same problem.