I watch my regional sports channel more than I watch ESPN.
That's true of me as well, but what happens if my favorite baseball team, the Orioles, make the playoffs, and those games are on ESPN? After the relatively successful season they've had this year, assuming they finish reasonably strong, they'll also probably be on ESPN Sunday Night Baseball some during the regular season in 2013, and those games are exclusive to ESPN (unlike the weekday regular season games that can be simulcast by the local RSN).
The Ravens appear on Monday Night Football every year these days, and those games are exclusive to ESPN (And I watch
every Ravens game in it's entirety), plus invariably they'll be a few other MNF games I want to at least watch part of. Sometimes a buddy will call me and say "You need to turn on this game, it's tied up with 5 minutes left in the 4th quarter. Sometimes some of my fantasy football players are participating in a Monday Night Football game that will decide the outcome of my fantasy game for the week. Sometimes I just feel like watching or at least having MNF on in the background because it's iconic or there's a good match-up.
I'm not big into the NBA, but if you follow the NBA, your favorite team may be on ESPN sometimes.
And ESPN is *big time* into college sports. Seems like the University of Maryland football and basketball, even though the programs are relatively "down" right now, are on the ESPN family of networks (ESPN, ESPN2, ESPNU, ESPN3 online, etc..) almost all the time.
Also, if I'm just looking for sports and nothing is on either of the RSNs, of course ESPN is the place I check.
ESPN may not be one of my most watched channels the way the RSNs are in-season, but it's definitely a channel that is important to have there.
Sometimes having the option to watch when you want to or when the right game is on is just as important as volume watching.
A lot of people will pay Netflix $8 a month just to have a queue set up and a disc to watch whenever, and let it sit there for a while instead of watching-returning-watching really rapidly. Arguably, they don't get as much for their money that way, but they know it's going to be there if they are in the mood for a movie that they've hand selected in advance, and that it's already paid for, and they can kick up watching them and sending them back in if they get on a roll watching a show or watching various movies; and that sort of gives them peace of mind.
A lot of sports fans may not watch ESPN a ton, but knowing it's
there means a lot to them. Wanting to watch the big MNF game one day and then finding it not there can be a big blow if you feel like you've been paying to have the option to do that.