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On my site I have been averaging 16 cents per click versus which is still $hitty. On my site 40 cents net per click is what my other context ads pay BUT - kontera is passive and the monthly check is better than a sharp stick in the eye AND you are allowed to mix it w/ adsense.
Watch out for their code slowing down the speed your pages load - they sometimes have "server issues" bla bla bla.
I had to remove them from my important pages because of this.