The band is just not as in to it as they used to be.  I guess it makes sense though considering they've been playing the same 15 songs, and using the same "I'd suck your dick just to taste her pussy" jokes for the past 6 years or however long its been.  Unfortunately for all of us bands get burned out.

If you've never been to see them though, I'd definitely recommend giving it a shot. Just don't over do it as I have.  Even if they don't end up playing a lot of tunes, there is always some slut that's willing to get up on stage and flash her boobs or make out with some other drunk coed.