Well, if you just spend 30 minutes to surf your site and see the ads that are displayed in your site and check them randomly one by one (don't click the asd, just see their URL and type it in a new tab/window) like this, you will find out if the sites are MFA or they do really provide services. Like this you will for sure eliminate those 0.01 ads per click. Well, you will still have the 0.05 ones but much better (actually the rate per click depends on the content of your site, i.e. topic your site treats).