AT says that if our contributions are good enough, then we get a hike in our points. And if our posts are not that good then there will be a reduction in our points. For example, you posted a thread, and you got 3 points for it. Now, if the post is a good one, then the editors will give you either 4 or 5 points depending upon the quality of your thread which includes your vocabulary and grammar. And if the post is not up to the mark then the editors would reduce the points to either 1 or 2.