I'll make this brief so I don't bore Rhett to death. Here is the response from Tickets.com:
"Convenience and Processing Fees are standard for nearly every on-line ticket purchase and are approved by each of the venues that we provide ticketing services for. Convenience fees are charged for the convenience of our service, saving the customer the time, trip and trouble of purchasing tickets in person at the box office. The processing fee is charged per order, for every order to cover the expense of processing the order. The only methods of delivery we charge extra for is Federal Express or Certified Mail, and even when those methods of delivery are chosen by a customer, the customer still pays the processing fee. These fees cover such costs as hardware, software, networks, ticket stock, envelopes, postage and labor, and are clearly displayed during the on-line purchase process."