Hador, the cost of frum Jewish kosher daily living is less on a yearly basis in the NYC/Monsey/Lakewood area than OOT frum kosher areas.
Additionally, the growth of the frum community in the NYC/Monsey/Lakewood area is greater than the frum growth OOT. Indeed, many of the newer frum residents in the NYC/Monsey/Lakewood area moved there from OOT. There are numerous OOT areas than have experienced a dwindling frum community.
And as described earlier in the thread, the NYC/Monsey/Lakewood area has a plethora of frum services such as kosher groceries and food options. Yeshivos, Botei Medroshim, Chesed orgs (Hatzolah, Shomrim, Chaveirim, Bikur Cholims, Tzedakah orgs, Gemachs, etc.), in addition to the easy availability of many roshei yeshivos, rebbe’s, gedolim, etc, that aren’t nearly as easily or readily available in other towns.