Just wanted to share this tip with you.
If you are using Google Adsense or any other ad network out there you are loosing money.
Why? Because they are are the middle man between you and another business.
My recommendation if you are making money this way would be the following:
Use Adsense to see what type of ads are being displayed on your site.
Once you identify this, remove Adsense and negotiate directly with the businesses advertising on your site.
Not only you will make more money but it will be cheaper for the businesses so they will be happy to do it.
To your success!