Whilst not necessarily the same (but vaguely related to this topic) I think there is a real problem in developing countries with intelligent, good looking individuals (mainly girls) moving overseas to marry into more developed cultures. Certainly back in the early 90’s when I lived in Germany I was a aware of several blokes (lets say not so lucky with the girls) who somehow ended up married to gorgeous, clever and ambitious Polish and Russian ladies. I always though that this was in some ways going to ultimately slow down the socio-economic development of those Eastern Countries as the best bits of the gene pool were being removed with obvious consequences.
Guess in effect, it is just another side to the old adage “the rich get richer, while the poor get poorer.”