I think you're making a very good point with the big city/rural areas argument. I'm sure most people, that have lived abroad would agree that surrounding yourself with people from similar origin is so incredibly easy. And to avoid that in big cities, where such societies are already established, someone has to purposely work on it. And that in itself is much more difficult and much lonelier than the alternative. And if your motivation for moving is solely economical, why would you do that?