The question is still what number people need to live "comfortably" (i.e. upper middle class). The average salary there may not quite provide for the amenities the average American considers "comfortable".
There of course cities with a lot of expats and activities, but imagine what - living there is not cheap. Cheaper than US / EU, but you still gonna need that $2000 / month.
Wont even start on topic of lost opportunities from lack of networking since we talk of some extreme downshifting here. But most people need friends and safety net at least.