Look, living IT costs much more in housing. And you get less space, no yard, cramped on top of your neighbors house literally a few feet away. OOT you have much more gashmiyus, etc.
Yet, nevertheless, despite the lesser gashmiyus plus the higher cost of housing, so so many Yidden choose to nevertheless live IT, give up the gashmiyus of nicer housing with more space etc. And even former OOTers, so very many of them, have chosen to give up the OOT gashmiyus and uproot their entire families to move IT for the great ruchniyos benefits in living in a full time Yiddishe environment surrounded by tens of thousands of ehrliche Yidden, Gedolei Yisroel, Bnei Torah, multitudes of yeshivos and butei medrashim, etc.
All over IT you can find many many former OOTers. Whereas the yeshivos are growing IT, unfortunately OOT the yeshivos are either stagnating or shrinking in most OOT communities. Because so many of their young families have moved out at marriage or later. Other than newish OOT communities that grow a bit in their initial years, it is rare to find a long established OOT community that is adding yeshivos year after year.