That is true, alot of bars, and sports bars in particular think they have to have sunday ticket, and in some cases, it is a big draw.
That said, I am good friends with the owner of our local sports bar. He had directv and sunday ticket the first two years he was open, and without fail, people would come in wanting to watch the Saints or the Falcons, and not much else. With the cost that they charge a bar to carry the package, on top of the increased price of just the sat service itself, he finally dropped it and went to Dish. He has not seen a decline in customers. With whats available on Locals and the various ESPN networks and regionals, he has the vast majority of it covered.