30 years ago the OOS tuition was about 3x instate at UW. Looking at history except for a brief period around 2010 it has always maintained that relationship. 30 years ago, OOS students paid 105% of the cost of their tuition. I don’t know what that percentage is today.
Colleges are one of the few areas that practice price discrimination. I see no reason why the University shouldn’t use its name to subsidize the lower income population of their state. Thinking back, all of people that I knew from OOS were either upper-middle or upper class. Not sure if much has changed.