With regards to how much you get paid per click, does it matter what country your adsense account is registered in ? For example lets say you have an international site and it gets an ad clicke by a person in the US. Would there be difference in the amount you get paid by Google if your adsense account were registered in the UK vs any other place, i,e Kenya for example ?
I have no source to back it up, but it is my understanding that your cPC is determined by (among other things) the location of your visitor/clicker, not your account.