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 ?
What you get paid per click is based on, in part, where your visitor is located, not on where your Adsense account is registered to. If an American came to your site with an Adsense account based in Kenya and clicked on an ad, it would cost the advertiser the same, everything else being equal (site quality, etc.) and would thus earn you the same as if the same site were linked to an Adsense account based in the US.