Well, here's my take:
There are the popular kids who enjoy the socialization aspect of the board and post for entertainment purposes - they make jokes, kid, & flirt, but from time to time have something deep & intelligent to say.
Then there are the smart kids - posts are always well articulated, thought out, and their vocabularies cause me to constantly google. I enjoy the threads they hang out in, but my attention span isn't typically long enough to match wits with them.
The trolls who are abvious...
The horny posters, who tend to post under the guise of seriousness, but who are really prompting stroke material; nothing wrong with that I suppose.
The pessimists, who seem negative, but whose posts honestly bring some balance to the board. Dr. Rock, Shelby, etc... they never seem to want to show me their dicks. Oh well. And they never seem to appreciate me appreciating them if they have shown them. But enough about me...
I kind of think that it all boils down to the personality type of each of the posters. Some are "always right" because they have more dominant personalities. Some seem to be quite gregarious because they are able to persuade people through charm. Some are just nasty because they have nothing else better to do, and somehow get affirmation from putting others down. We call them trolls. Everyone else, IMHO, is jerking off...