Given the current state I would bet 3/4+ of the FTA boxes are being used for pirating. Lets see you can pay $100/month to Dish, or you buy a FTA box, flash the box and get free Dish... You are living in a dream world if you think people everywhere are not jumping on this "free cable".
Yes, a ton of FTA boxes are being used legitimately, but far more are being used for free TV, it is just too easy. Even if you go with the cheapest Dish plan, your FTA box will pay for itself in 6 months of pirating. Comparing against AEP and you pay for it in 3 months. FTA is a nice hobby which a lot of people like, but it pales in comparison to free cable.