They don't make money on admission anyways.
They make money on 15$ beer and 7$ water.
I don't know if I'd go that far...say the avg ticket is $20 and they get 30k people(which I'm guessing is low?)...even if ticketmaster sucks up $5 of that per ticket it's still $450k per show...they make 30 stops and that's 13.5 mil