recently I've been playing around with my ad locations after revenue dropped significantly. I've also been using channels in the last two weeks to identfiy the best ad locations.
I followed various tutorials and after a week removed most of the other ad locations as knowone was clicking on them and left my most popular one [under the nav bar] in place and left it another week.
So, at the moment there is one ad below the nav bar on every page including the index. There are no other ads on my site.
Why are my earnings so low despite people clicking on them?