I seem to be make myself not very clear. I am not saying that I show only one add per download.
I expect on average 5 Impressions per download
How do I get 5? Just guessing. Some will download and play only once (so I get like 2 Impressions) and some will play very often.
Can you be a little bit more specific? Which of my numbers seem high? An eCPM of 10$? Or the 5 Impressions per download?