I started using infolinks recently. Apart from Infolinks, I am also using Adsense and media.net ads. When I look at the infolink reports, I don't quite understand how infolinks is actually paying to the publishers. In a certain day, even when I have over 100 page views and over 600 ad impression, there is no earning. What kind of ad network is infolinks (I though it was CPM based)?