Not splitting the atom here but thought exercise.
Economy from 1 track
Let's take Kanye - on majority of his tracks he gets 500,000,000 plays per track that's (average numbers here based on spotify stats). At $0.01 per spin that is $5,000,000 directly generated from 1 track.
Split it 80% to artist 10% to label (do you need labels anymore?), 10% platform.
Artist - $4,000,000
Label - $500,000
Platform - $500,000
Spotify charges $9.99 per month. To have same cost for the user at