Good discussion. I was wondering about the same thing a while ago. I also believe that people here (especially the ones who post a lot) are either:
1. Very motivated and really want to get all the info they can
or
2. Have no one to talk to, thus probably from an unusual industry or IT/Tech.
Or both.
I'm here for both reasons, and as an engineer who works for the government, similar to riverripper, I have almost no one to talk to about the MBA except for a couple co-workers who are also applying. This forum has given me a great outlet to vent my frustrations, celebrate my triumphs, ask lots of quesitons, and help out others when I can.
If all the prolific posters here represent the applicant pool, then I'm pretty screwed considering the competition from the likes of mNeo, lanter1, riverripper, ncprasad, and others (sorry if I didn't list your name, as it would be too long of a list!).
All I wish for is that all of us who pour our hearts into this application and help each other out will get into the schools we want to go to. We'll see each other in 9 months laughing at our current panic posts, right?