There is not much of an extra “heavy expense.” Food, gear and tangible supplies are the variable costs. Travel too but assuming more players will not travel because of increased scholarship limits. The big expenses are mostly fixed for NU. The number of coaches will be the same. NU will not have to add more professors or classes. The dorms aren’t full.
Yes, the athletic department will have to “pay” the university for the additional scholarship athlete but that is an accounting practice more than a real expense. Would be a different kind of impact if NU were the type of school turning down applicants due to having no room for more students.
What about the health related expenses? I’m sure the insurances cost out the roof as well as physical therapies, etc.