http://www.whizzbangsblog.com/content/view/300/86/
More great charts in this piece.. I never liked Google "smart-pricing" because it rates Google's own traffic at the 100% level.. If your traffic converts better than Google's (which most domain traffic does) you don't get paid any extra. This is going to backfire at some point as the good traffic gets removed and sold to lead-gen guys and others who get this.. leaving the se3cond rate traffic on PPC networks.. not today tho.
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