You may not know this.

You can weed out low-paying ads on your webpage with a competitive ad filter in your Adsense account.

Sites like http://www.adsblacklist.com/ help you to generate a list of urls- that need to be blocked to increase the revenue at your site.

Just sign up and input your webpage that runs your Adsense ads - the site suggest you a list of url - which can be copied and pasted into the Competitive Adfilter page of your Adsense account.

Earn more money now!