Haha! I've heard Rosen quote George Will (I think) in saying, "If I'm blowing cigar smoke in your face, then I stop blowing cigar smoke in your face, I'm not giving you clean air."
You earn $100 they take $20. Then you earn $100 and they only take $15. They didn't GIVE you $5. They allowed you to keep $5 more of what YOU earned. How nice.

