Points are based on the number and length of your posts. You gradually earn them, so don't go out and spam just because you want to get to 500 for an avatar.
exactely, posts liek that wont get you anywhere, u need to have a long post that is good not just rambling, then u get a bad rating if u ramble on fol like 4 paragraphs. and points dont really matter, except in ur case.