I'm not sure either. Does Kindle allow for customized advertising? One problem this magazine has is that 40% of their subscriptions are outside of North Ameri

I'm not sure either. Does Kindle allow for customized advertising? One problem this magazine has is that 40% of their subscriptions are outside of North America. It's a good thing overall, but they could increase ad revenue by printing two books -- one for NA and the other for "world" (mostly Western Europe in practice) and selling space in just one or the other.