I can shed a little light on the orginal question, having worked in the entertainment industry briefly.
You are paying for eveything it costs relating to a production: advertising (radio,TV, internet, billboard), promoting (comp tickets to businesses, radio stations, charities) , employment (stage hands, sound, setup, much more), legal services, travel, venue services (singly the largest set of fees), products (T-shirts, CDs, DVDs, programs, all the trinkets they sell at a concerts) and oh yeah, profit.
I was rather appalled at the number of venue fees that are tacked on the price of a ticet, especially since at the time I had recently purchased tickets to the tune of about $90.