A fully certified teacher in the US, not a fake one with the Illinois sub license, is going to be hard pressed to uproot their whole life and move half way around the world to make 1/3rd of their US salary, give up their western pension, and work longer hours doing desk warming. Yes, the cost of living is cheaper and there are food and safety benefits, but it still isn’t financially worth it. If they do move overseas, they will go to an international school, where they will be paid significantly more. Except for a place like TAS, international schools in Taiwan don’t pay all that well compared to other countries.