Thanking the bus driver?

Do you thank the bus driver? If yes why do you do it? Some argue he's not doing you a favor so you shouldn't.

I usually thank him and ask how his day is. Then I reach down his pants and squeeze his cock gently, before unzipping his pants and placing my mouth on his genitals.

This is considered polite here in France.

Of course this holds up the folk behind you so you need to say sorry to them by giving the same courtesies.