Wow, such a great thread bud, highly informative to say the least, I have once thought about doing something like this but unfortunately, I wasn't in the best position to, since an information like this will require someone who has some access to some vital information regarding Karma from the forums database, and good enough, @PX-Z has proven to be in the perfect position to track such information and make it public to the entire forum users.. Kudos ones again bud...
Seeing that I am not in the top 100 makes me very hungry already to get there by the next update, I believe data like this will encourage alot of forum users to do nothing but their best in creating highly quality, educative and informative post, so as to earn enough positive Karma to appear at the top.
Good luck to us all.