I subscribe to all of the movie channels for different reasons. HBO and Epix have me for the movies. Showtime has me for the original series. Cinemax has me for both. Starz and Encore because it's either cheaper or only a few dollars more to have them than not have them with my package. Gives me a chance to see the Pixar CGI movies I guess.
Epix basically has the movies Showtime would have had CBS and Viacom never split. I can't think of a movie I've watched on Showtime recently (or ever), but I just watched four that I've been meaning to check out over the Forth of July weekend. I do however watch just about all of Showtime's original scripted and sports programming, 11 shows total. By far my most watched channel premium or not. HBO's high powered slate of originals never did anything for me. The Soprano's and Six Feet Under were great, Boardwalk Empire I felt was really dry but stuck it out. Currently Silicon Valley is the only thing I care about on there and True Detective if it comes back and if it's the same caliber as season 1. No matter how hard I tried I could not get into Game of Thrones. With a few exceptions, shows that take place in anything but present time do not hold my attention and the whole historical fiction and fantasy fiction sub-genres do not interest me whatsoever. The few originals Cinemax has had are all great and they premier HBO reject movies, some of which I actually want to see. I've watched at least the first half season of a few of Starz's original programming (The Missing, Black Sails, Magic City, Girlfriend Experience) but lost interest quickly.