Its nothing to with that. The more competition we have for adsense the more likely adsense cpc likely to go higher.
I've given up hope for now of it going International, or to the Uk at least As I've said before its a cycle. To benefit publishers, adsense and Yahoo themselves they NEED to go international.
I think if this Panama-thing is working for all their current advertisers, the next thing would be for YPN to go international. That just makes sense, IMO.