Disclaimer: I work for Dish. Not in a position to have any inside info about why. Strictly my opinion.
Why does Dish have more provider disputes? Charlie Ergen is determined to position himself as the lowest priced of the major providers, and to do so, he has to be aggressive on renegotiating contracts. Other providers seem to be more willing to take a higher percentage price hike without a dispute, it appears.
One person above guessed that all the providers care about is money. Well, of course, that is true to an extent. The goal of the people that manage a corporation is to maximize profits. That's the same for everybody. Each company has their own way to attempt to do this. There are no doubt many people inside the corporate offices of every provider who are calculating total profit based on profit-per-customer multiplied by total number of customers. Cut the margin too low, it takes too many customers to make the total profit desired. Move the margin too high, risk losing the number of customers. Each company is looking for their sweet spot. The margin, of course, is based on the revenue per customer less the cost per customer, and this is Ergen working aggressively on the cost side.