Top 20 highest paying Adsense Keywords of 2012

"AdSense is a contextual Cost per click (CPC) based ad network run by Google.  In last year Google made $33.3 billion in revenues."

Since this is a CPC based system, it has an unique determination to figure out the cost of each particular click through.  Occasionally, for competition, the cost of a keyword may become too high (about $50 to $60 Per-Click). Here is a list of the twenty most expensive keywords offered by adsense.  Although I cannot confirm if these are accurate, there has been an occasion where a click through on my own site was a nice amount.