because being born as an average sea person is still shit compared to the kind of money they can make in the west. the only people from the west that are moving to sea are taking advantage of the currency arbitrage. somebody born in the west with no money and no education will still live a shit life if they moved to sea. hell most sea countries won't even give you a visa unless you have considerable talent, a business or a lot of cash (retiree visas).
United States