Well, that's just one sport. In New England at least (and I assume this situation exists in other places as well), a lot of the local sports are primarily just on cable--NESN in the case of New England.

I don't watch much in the way of sports in any case, but a lot of people buy cable and satellite sports packages.

I actually agree with the basic point up-thread though. I do think a lot of people probably pay for their monthly cable package without a whole lot of thought about how much value they're getting and what alternatives there might be.