This for those who wonder why their CPC is pretty high. If your QS is Excellent (9 or 10) getting clicks for 1 - 2 cent is not impossible. Look yourself (NO i am not trying to sell an ebook on how to get penny clicks) instead just a motivation. As always said Target Right keywords - Show the Right Ads - to the right audience - Land them on right page and there you are.
You can also place bid on low budget long tail keywords, its also one of the trick to have maximum visitor in low cost.
There are many keywords out there that are 1-2 cents per click, but they are in niche's that obviously don't pay well for adsense, otherwise they would cost more. I get thousands of clicks per day for one of my sites for less than 2 cents cpc.