Author here. The estimates could go either way. Kindly note that the stats are incomplete, notably the welcome page is missing.
Some ads are cheaper, some countries are cheaper. Put 3 ads per page from 3 different networks to counter balance. Then force the page to refresh once or twice. There are many ways to optimize revenues when one really care about revenues.
I hate to break it up to you but your site is picture hosting, it's low engagement and low value. People will not try the wrong "download" button 3 times until they find the right one, only to do the same thing again next week for the new episode of games of thrones.
Some ads are cheaper, some countries are cheaper. Put 3 ads per page from 3 different networks to counter balance. Then force the page to refresh once or twice. There are many ways to optimize revenues when one really care about revenues.
I hate to break it up to you but your site is picture hosting, it's low engagement and low value. People will not try the wrong "download" button 3 times until they find the right one, only to do the same thing again next week for the new episode of games of thrones.