You will get less than five stars (circles) if you don't have three regular ads on your pages, although Google says it has no bearing on your ranking. I have one 728x90 one 300x250 and one 160x600 AdSense ad on every page of my website. Many times at least two of these ads, and sometimes three, on the same page are the same ad. How can we justify keeping three regular ads on a page if they are the same ad? Would it not be better to just replace one or two of them with another advertiser? How does everyone else handle this?