Did you know?
You can earn activity points by filling your profile with information about yourself (what city you live in, your favorite team, blogs etc.)
I think that you've got it right on! A system of checks and balances like the one you outline would certainly help keep the game players and "dive bombers" at bay. I also think that the thumbs up thing should be incorporated into the rating system to emphasize the importance of posting messages that others find interesting and important for others to read.
