I have one page on my site that brings in most of my AS revenue. I noticed via my AS tracking that the #1 clicked ad on that page is a MFA site. This ad is almost always showing in the #1 slot in the Google ad unit. People have mentioned blocking MFA sites as a way to increase revenue. But, isnt the fact that Google puts this in the #1 spot an indicator that it will bring me the highest price per click? Or is that wrong? If I block it, and Google shows the #2 ad, will that pay less? Any thoughts?
I disagree. If Google stopped taking care of (the quality of) the whole AdWords/AdSense system, then people would no longer be interested in clicking on Google ads (considering them spam), and all three parties would be harmed. Publishers, advertisers, and Google. However, Google would in fact be the biggest loser of the three parties, as advertisers and publishers would sooner or later switch to alternatives -- Google's (future) competition (YPN, MS, etc).
It is in Google's best interest to ban MFA sites (and other kinds of spam). I am positive that they are aware of it.