Ah! But that begs the question of why. So unless it's just that most people love the idea of bundled services (cable/ phone/ internet) and/ or the pricing was better elsewhere after the commitment period there's probably one or more issues with Dish that people don't like and want to jump ship at the end of the obligation.
I doubt it's only some frustration with rain fade, though we all know how that goes. Ironically it was rain fade that most influenced my choice to buy Tivo just to have something to watch during a disruption and to make it easier to search for re-airings of shows that were interrupted. And now Tivo doesn't work (or should I say isn't allowed to work) with DBS in HD, which also may be a reason some choose to switch providers.
Looks to me there is a real concern for both DBS companies, given other options available today. I think they're gonna need something more radical than a 2 year commitment clause to draw & retain customers outside of the boonies. So far the 1 advantage they still do have is the ability to provide service to a moving vehicle.