I think that there's little relation as to whether people have a life, or not, just by the number of posts that they have. I have a very rich social life, yet I have one of the highest post counts. Other factors come into play. Is the person a fast typer? Do they have a lot to say? Do they give short answers? Do they post in the Games Forum? Do they like the looks of their own avatar? Is there some music listening site in the background, like YouTube, that's keeping the person on WP, as a result? There are many factors that can go into a person's post count. I've also been posting here, for almost 6 years. 
_________________
The Family Schlager