Wow. Lots of numbers. Clearly you’ve put some thought into this. One thing to think about is timeouts. Most of these services are well aware of the expense behind playing music when no one is listening. They’ll often check “are you still there?” And if you’re not paying attention and there to click “continue,” it’ll just stop streaming. Good luck with this though. The music industry does have a lot of work to do and you pose some great questions.