Is this curiosity, or a moving goalpost as part of an argument?
Seems to me that completely depends on the school. Maybe international students will only come to a particular school if they get a free ride, while local domestic students will pay the tuition for the convenience of being near home.
At tuition-driven schools (i.e. most schools, but not the big ranked research schools we always hear about), most students are there as sources of revenue, except for the stars they can entice with full scholarships.
At research schools, research grants are the main source of revenue. The rest is a sideshow.
Also in either type of school, if they live off campus (far more common for MS and phd students than undergrad) then they are less revenue per student. Schools are essentially in the hotel business too. We are learning all about this lately.