I post when I have something to say. I don't post when I fear I'll be overly preachy or uninteresting. Sometimes I am anyway.
One thing I'll say for these forums is that there never seems to be any long or personal debates. Everyone has their say and no one is berated for it. That much I really like, and I don't really understand why this site is so successful for it. Perhaps it is the fact that you can just Thanks button the posts you like, so various opinions aren't repeated too much. Still, it is pretty remarkable, considering what the rest of the internet is like.
Perhaps what makes this site so useful is that everyone who posts here has experience. No one is speaking from a position they've never occupied. You never have to agree with the advice you're given, but at least you know it is from someone who's used it themselves.