When nature calls, costs vary by location

The photo shows Luxembourg railway station in Luxembourg. There was a loo under the arrival / departure lobby and cost 1.1 EUR for one. I've used the same kind of service in many different cities in many different countries. For example, a loo at London Waterloo Railway station, the UK cost 0.3 GBP, Oxford Railway station, the UK was free of cost, a loo of a Christmas Market in Frankfurt, Germany cost 0.5 EUR, Milano Cadorna railway station, Italy cost 0.5 EUR, a loo near Chumphon Gate in Nakhon Ratchasima cost 3 THB.