You also get more VG$ for longer posts.
So, if you post a short, three-word reply to somebody, you get a couple cents. However, if you post a long, five-paragraph dissertation about why you think third-parties are wasting money releasing multi-million dollar failures on the PS360 yet do less-than-a-million-dollar shovelware for the Wii and make millions, you'll probably make millions yourself.
And since each post in a thread you post works the same way as you posting on your own, someone else's long posts will also make you a substantial amount too.
In other words, I've probably made you more money than anybody else in this thread as of yet.