For the people that knows everything... How do you know that all MFA sites pay a few cents ? How much is "few cents" for MFA sites? How much it would be acceptable?
Well, right now there are two ways of looking at it. One is that it may happen automatically for a lot of them, the other is yes, put them in your filter.
This is useless way to do it. Best way is to monitor your ads and block what is displayed at your site.
Not all MFA sites paying low $ per click.... How'd they know those site paying a few cents? Is there any evidence about that? LOL When I remove all of MFA list from my competitive ad filter box, my earnings per click is increase. We don't know exactly when they increase their bids in AdWord. Which on do you choose to be filtered out: 1. MFA sites with "unknown" earnings per click 2. Not MFA sites (e.g. your site) with $0.01 earnings per click