I think it perfectly makes sense since smarter people understands better and able to make out the difference between ads and real content.
To my knowledge... I had never clicked on ads.... either on my domains or on others
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Well, I don't think you can really generalize that far or else we would only see industry advertising in depressed economic areas... where the consumers don't have money to buy anything....
Course, I still don't understand why gasoline costs 50 cents or more a gallon in W.Va. than it does in Washington D.C., Virginia, Kentucky, Tennessee...just more taxation of the working class I guess.
Maybe the more educated people have ad blockers and other things installed because they know computers better.