Austria and Prague 2019 - Paying to Pee

I have been abroad several times now and there is still one, seemingly venerated tradition, I will never get used to, paying to use a public restroom. We learned to time our bathroom visits with restaurant visits so we could avoid this, to us, peculiar cultural rite. I did find myself thinking, as I watched an attendant make change for desperate looking people, what does he say when a new acquaintance asks, "So what do you do/"