LeaveMeAlone yes,so even if they accept international webmasters,their accounts will be terminated sooner or later,as almost all international webmasters are getting some x% of international traffic Asking a webmaster to implement Geo targeting and accept Y ads to US visitors only is absurd but i am sure that they will add Geo targeting at their side sooner or later
Yahoo has been in beta for so long and I doubt they will ever get it together. They can't include new publishers or international publishers because they don't have the advertisers. I think they were hoping that the Yahoo Publisher Network would spawn new advertisers. I guess it hasn't developed yet.