They do not last 3 months, either, but Disney and Starz seem to have no problem letting DirecTV give Starz away for 3 months to new customers.
We also have yet to learn if it really was Charlie's plan to extend the preview for a whole year. Perhaps he only intended to go it for 3 months (as may well be agreed to in the contract), and then start paying standard licences.
Also, the NFL was do to the NFL's indisgression. They signed an agreement with Dish saying they would be the exclusive home to a number of NFL games in exchange for lower package placement, then immediately broke the deal by selling games to local broadcasters.
Well, according to that last quote I posted, it seems like it was Charlie's plan because it seemed like he was angry at Starz for offering their content to Netflix, which Dish sees as a competitor. So I guess Charlie was like "Screw them! If Starz is giving away their content to Netflix, then we'll just give it away to all our subs for a year. They shouldn't mind, right?, since they already devalued their own channel themselves."