Hello

There seems to be a lot of opinions on blocking Google AdSense Certified Ad Networks.

Reasons for blocking go from "they are trying to sneak in the backdoor using one, or more, of these 3rd party networks" and "if I wanted crappy low-quality ads on my high-quality site I would have signed up for crappy ad networks" to "if the advertisers were that good, they'd be using AdWords"

Reasons for not blocking are that "advertisers from external Google-certified networks will be able to compete with AdWords advertisers for your ad space"

So if one would apply common sense and know that AdWords is an auction based ad system, then as AdSense Publisher it would be the logical choice to enable all AdSense Certified Ad Networks to increase competition and therefor Revenue.

BUT does that simple conclusion holds up in the real world?

What are your experiences with blocking AdSense Certified Ad Networks?
Did you notice an increase or decrease in earnings?

Did someone run a test and cares to share the results?

What are your opinions about AdSense Certified Ad Networks?

I am looking forward to an interesting discussion

StarBuG