On one of my blogs... I get a lot of comments that have not much to do with the post. If I allowed these type of comments, does that get me a lot more traffic and essentially more money for adsense?
Actually those comments are called "spam" and aren't good for your blog at all. I personally use AdSense content targeting to block certain sections of my website and allow only certain content to be used to consider what AdSense ads will be displayed. See the below article... https://www.google.com/adsense/support/bin/answer.py?hl=en&answer=23168 Remember, sectional targeting is your friend.