Suresh I can't find the document, but there is a upper limit of 20 points per day for the responses. After that you can still get points from Correct and Helpful answers, but the responses itself won't get you additional points.
In all fairness to Suresh's post, I don't think that being aware of the point system is a bad thing Balraj. I used to be curious of why the points just stopped adding up when I am being so active. For the rule itself, I think it was good that we have these restrictions, otherwise it encourages people to post unnecessary stuff just for gaining points.