Send them to CJs and Toplists. What else can you do? letting them disappear, is kinda waste.
Even if you get 1 click from US for every 100 afgani clicks, its better than nothing. And if you redirect rightaway (without any html being served) then its 0 cost to you anyways.
It may be worthless to toplists and CJs too, but hey, they are doing the same thing anyways
So it all worksout nicely.