That makes more sense to me, since computers can handle a lot more orders per employee cost.
In short, TicketMaster is charging "convenience fees" purely because they can, while airlines charge you for buying a ticket from a real person because competition makes them charge for what actually costs them money.
First, which price do they state up front when you buy online? If it's the base price, then it's still wrong. My grocery store wouldn't be able to get away with advertising $1/pound at the location where I shop, charging me $2/pound, and saying that they do offer $1/pound as long as I travel to one of their other stores that offers it.
Second, why do people complain about TicketMaster so much if it's this easy to bypass? Is there some kind of hidden catch, or do all of these people hate these hidden fees enough to blog about them but not enough to go buy the tickets in person?