I am not complaining and I see the reason for this (maintenance, cleanliness etc.), I am just not used to it.
I can imagine that pee in your paints rate is much higher here.
The basic concept is that if you patronize a facility you do not have to pay for the use of the bathroom. Often, if you show the receipt you will not have to pay.
So, it is usually fair! One should just remember to always have change in the pocket.