I have a question for the landscapers around here..

Villas - I have a question for the landscapers around here.. When you go to someone's lawn to cut their grass ,is it a rule of thumb to pick up any bags, paper ,large twigs or sticks?? I watch a couple mow a corner lot where there is no house and they literally run over Everyting and Anything. I mean isn't it simply courtesy to the yards around it cause now when they leave we are stuck picking up all the lpapers now blowing onto our lawn. Please people pock up the cans and bottles and trash before you mow... thank you