If I listen to 10 songs in a month all by artist 2 and you listen to 1000 songs by artist 1, should my subscription money all go to artist 2 or should it 'subsidise' your listening to artist 1. That is the core question.

Basically do you put all the money in a pot and then split it, or do you treat each subscriber as a unit and split their subscription fee just among the music they listen to.