If you experience difficulty with getting high CPM, please take into consider that RevenueHits is a performance based network.
Which means that we work mainly with CPA - Cost Per Action. You may earn money not on impressions or clicks, but when an action is made by your visitors.
An action can be many things, for example: a sale, contact request, newsletter sign up, registration, filling a survey, etc.
Our pop-ad considers to be the "Best Seller", according to the amount of satisfied publishers and their revenue.
So check our Blog and discover more about its ability to increase your CPM.
Moreover, it's very recommended to contact your account manager for more info and help.