When you Master the Art of using different ad formats based on your content and design. YOu ll get a similar rate very often...Ofcourse it would also depend on the theme of you site and teh amount competitors pay for their ads which is beyond your control.....you can only control whats on your site which are experimenting with different ad units
Mine was $2 I think. That is rare though, as I usually only get a few cents per click. Mite site doesn't really target the best keywords. I need to try and find some ways that I can legally and legitimately sneak in some higher paying keywords.