I would ask why you keep following the comic then but I recall there are just a lot of people who love following bad stuff just to complain about it...
Well, usually I'm much more interested in the humor when I follow a story (at least a story like that) but there's definitely character growth at least for a few people... Hanners, Marbear, a while ago somewhat for Faye...
Although, in general, I think character growth is overrated. Not everybody needs to change for a story to work. Some people are just the way they are and they are fine with it. (Well, Marten is not fine with how he is himself but still)