I worked at a company that was acquired by Ticketmaster, and I have a change to talk to one of the executives in casual way. They are not as bad as the may seem, but the business model is definitely intriguing.
They go to a venue that hosts, say U2 for a concert. Say a U2 wants to sell a certain ticket for $100. Ticketmaster says: Look, If I get exclusive rights to sell your tickets, you will get not 95%, nor 100%, but you get 105% of the price of ticket, because I can charge whatever fees I want.
So when you complain about Ticketmaster's high fees, hate then just slightly less, and hate U2 a bit more because they are ripping you off by pretending that Ticketmaster is the only bad guy.