I should also note that I think people who post in chatterbox, off-topic and stuff still contribute to the community!
Yes, sorry, ofcourse they do! xI
But, what I meant is, not in the same sense as someone who takes the time to make constructive posts answering question, giving constructive criticism, encouragement, or advice. Stuff like that.
It's a lot easier for someone to get a lot of posts in a chatting thread, but someone doing the above is actually contributing the same, if not more, however is doing it trough a drastically smaller number of posts. So, in order for it to be accurate, it would have to compensate for that.
In my idea, the easiest way to that, again, is just to make node not count any post made in the chatterbox board.