haterobics said: "I've never sorted out why, when I act as my own box office manager, select my own seats, process my own payment, and use my own computer, printer, and ink to create my own ticket, *I* have to pay more money... but if I go to the box office, and make someone who is already on salary do that, and use all of their resources, then it is free? Doesn't that seem backwards?"
The show pays for the box office to be open at the theater. Online ticket fees pay for Ticketmaster and Telecharge to be able to keep Ticketmaster and Telecharge running (and, occasionally, improving).