I don't write a lot of these unless something major is going on (usually something bad because my first instinct is to reach out for help) and that's largely because I'm an extreme introvert. I don't keep up very well with social circles, I don't even talk to my parents very much, so posting journals to say what's happening in my life (the cliffnotes version: a whole lot of nothing special) is just completely alien to me.
Furthermore I don't typically read journals from other users. This isn't to say I don't care what other people have to say, or that I'm somehow better than anyone else, but more often than not the information isn't relevant to me, and considering I'm watching over 2000 profiles on this site, albeit of which I don't know how many are regularly active anymore, keeping up with all of those journals would be time consuming, and frankly kind of overwhelming. So I just don't.