mm. Dosn't this look like fun. Heh. Anyway, I'll just quickly step in with my 2 cents, since I almost never post anymore . . .
You don't need to post in a "helpful" area of the forum to be contributing to the forum. If there wasn't an off topic area, you wouldn't have *the* busiest, most popular, and largest section of the forum, and you would drop a decent chunk of the community.
Post count only means how many times you have posted in the areas of the forum that count for the post count. Its only a number, it means nothing more than that.
As for your leaving, well, Goodbye. I'm not a fan of these threads. If your going to leave, leave in peace. Anyone that actually cares probably talks to you on other mediums and knows your leaving anyway.