I have a site that is of interest to a certain segment of the U.S. population but is of little value to anyone outside the U.S. The advertisers who appear via AdSense are selling things that are of little value to anyone outside the U.S.

I see that people from a certain country visit this site often. I've often suspected that the interest is suspicious and the number of times my content ends up on sites owned by someone in that country sort of confirms my suspicions.

One theory is I should just leave it alone and let people from that country visit and click on ads. It's up to the advertisers and Google not to show ads to people in a country that have no use for the products or can't receive they products if they wanted. And I earn off every click whether the person has any intention of converting or not.

Another theory is I should block visitors from that country which will result in better traffic and a better conversation rate for the advertisers, and in turn Google will reward me with a higher EPC for that site.

Is there evidence that the second theory is correct? Does Google provide incentive to publishers to deliver quality traffic?

FarmBoy