Brown is private, so there is no distinction for out of state students.

That's nominally 50k/student they can then offer scholarships so it's possibly nobody actually pays that much.

Further, just having a teacher without a classroom is not going to get you very far. Still, assuming the average student pays 1/2 that much per year they can probably cut the costs significantly.

Aren't there other expenses like maintaining the campus and paying for journal subscriptions and research equipment?