Even if it's lame to you it doesn't mean that the people who do in fact live them didn't want to in the first place...Yes there are plenty of posers out there who act like that because they have no where else to fit in, but some people can't help that.
I think that in general, if you're behaving "Katatonic" to fit in, you're wasting your time. I always got the impression that the "katatonia lifestyle" was about as anti-social as you can get.
A lot of people miss a very important point about Katatonia's music; the characters int he songs, no matter who they are or what they are doing, are usually not happy to be forced into the lifestyles they are living. Just look at Tonight's Music for example. "How could this go so very wrong, that I must depend on darkness?" He's not happy about it at all, so why would you be?
On the other hand, I'm not a social person, nor do I particularly enjoy sunny days or bunnies or duckies or Smash Mouth, so I'm drawn to this kind of music. My lifestyle is my own, and the fact that I like Katatonia is a reflection of this, not the other way around.
Also, in direct response to Brave.Archangel, I enjoy Katatonia most when I'm in a good mood, though they are comforting when I am in a bad mood as well. I am a strong believer in musical Catharsis.
Hope that makes sense.
Rorix