Leosghost - 9:01 pm on May 24, 2013 (gmt 0)
I'm pretty sure that blocking countries for the purpose of increasing your AdSense earnings is a big nono. It doesn't matter how you try to validate it, bots, poor nations, they'll probably can you. It's not a good idea to post shady things like that publicly.
You jest ..you seriously think that G want you to be showing ads for medical supplies and scooters for senior citizens in Los Angeles on your site about Seniors in LA ..to people from Karachi..? ..You think that G and the advertisers would be happy about them paying for the clicks..?
"Risk to advertisers" ( costing them money for no perceivable benefit ) is usually in the "banned messages" that folks get from G..