I have a game I just launched. I had my ad active for about 3 days before publishing the game, for test purpose. In the first day, my RPM was $1.80. Then a couple days my views were 0 (I "bought" the premium version of the game that removes the ads, for test). Now I published my app yesterday, and my report today was 1.9k view at the RPM of $0.02!!! Why is that? I hope to get a response or explanation for this, or I will surely migrate to other ad services! What can poosibly cause the RPM to drop like that?