We do receive approximately 1M pageviews a month - with usually 2-3 ads per page.
The company who does the selling now has a sales funnel that we cannot match. Close relationships to big companies to whom they sell very relevant campaigns.
This said, we make approximately $2/3,000 per month with advertising.
I believe it's really small. They say it's because half of the pageviews are on mobile so many of their ads don't show.
Even this considered, I am growing tired of having that revenue amount as my only benchmark. I have been asking for detailed reporting for months and have not received any...
Regarding the choice - why no DFP? It seems to be the easiest one.