Hi I was thinking that Google only allows 3 ads per page on a website so I checked out what Google says. Here it is "Currently, AdSense publishers may place up to three AdSense for content units on one webpage. You may also place a maximum of three link units and two search boxes on each webpage." So I guess I was half right. Here's their page with a little more info. https://www.google.com/adsense/support/bin/answer.py?hl=en&answer=9735