Excerpt from: Don't Waste Time on Google AdSense
The biggest advantage of enabling third-party ads in Google AdSense is that you will have even more advertisers competing for your ad space, driving up the highest bid and maximizing your website advertising revenue.
Google AdSense first and foremost draws from the vast Google AdWords ad inventory to place Google ads on your website. In addition, you have the option of receiving ads from any number of third party advertising networks that are certified through Google. Many large, top-brand advertisers use third parties to create and manage their display ad campaigns, so that means added competition for your ad space. And Google always ensures consistency so that the average user won’t know the difference between a Google ad and a third-party ad.
The primary advantage of increased ad competition by third-party ads in Google AdSense is that you’ll maximize Google AdSense revenue. The more quality advertisers competing for your ad space, the higher the bidding for ad placements on your site, and the more money you make when your Google ads are clicked.
Avoid common pitfalls and make money with Google AdSense by reading Don’t Waste Time on Google AdSense.