Get your taxes done using TurboTax

This really doesn't answer my question. I obviously know they are charging us for the state returns and the option to avoid them is to print the returns and mail them. This is what I'm forced to do now. But the question is, why do they charge us? Does it cost Turbotax to process these returns that they feel they need to pass on to the customer? Or do they just do it to earn extra revenue?