This is wrong. Many US colleges don’t get the “top students” from other countries but on the contrary get absolutely horrible students from other countries, but

This is wrong. Many US colleges don’t get the “top students” from other countries but on the contrary get absolutely horrible students from other countries, but they pay more than mediocre-but-better American students. American students do not see any discount for it, savings are not passed to students. A majority of US universities are not top-tier Ivy League schools. It may be different for those schools and for PhD programs.