Lights in Public restrooms

Marykae:

I work in a rather small office building. The restroom on each floor is only shared by, hmm, less than ten offices.

It occurred to me as I walked in one day to change (I walk to work) that if the lights are off when I come in, why not turn them off when I leave? It seems to be accepted when you enter a public restroom that you should leave it in the state you enter it in. Why?

If there is a light switch in an easy to find place, and the restroom is not occupied, I am now going to try to remember to turn it off. It might stay off for hours.