ujm, you probably using circular logic here: you call “frum” those who live in your community and non-frum those who are not. Then, by your definition, frum move towards your communities. My impression was that the impressive growth of the communities was mostly due to childbirth, not immigration from Deep South and Midwest, but I may be mistaken. In the OOT communities, there is definite in- and out-flows, as everywhere in USA, but I see more, as Avira says, arrivals from the “in towns” into teaching, kollels, colleges, jobs. Those who leave into “in towns” usually have previous connections to those places, or go for learning or Jewish colleges. Others leave to other communities or EY.
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