When I call your company and you need to put me on hold, DO NOT MAKE ME LISTEN TO A CONSTANT STREAM OF COMMERCIALS. Play quiet music. That way, it's easier to zone out and work or talk to someone else while you wait. With a babbling brook of cutesy nonsense (I'm looking at you, Southwest), it's much harder to focus on productive activities while the CSR has you on hold.
Advertising "law" says different. You are the companies target audience. Advertising to you is like shooting fish in a barrel, annoying as it may be.