If tuition is not considered a loss, surely every other expense would be considered a loss then. A medical school student isn't working a part time job to pay their rent and feed themselves; that's all out of pocket and a pure loss.
As I said above, corporation have a much larger set of things that are considered deductible against revenue to determine taxable income. Starting with the fact that corporations are generally taxed on "profit" while people are generally taxed on "income", which is closer to "revenue" in general.