I have no serious need to know the answer to this question, but I'm mostly just curious (after applying for undergraduate schools 4 years ago and applying for graduate schools now).
What sorts of expenses are institutions trying to pay for when requiring application fees for the applications? Why is there a wide range of fees? (I know Stanford graduate school is $125, and Chicago is $55, and I've only applied to 5-6 schools so far.) Are the institutions just breaking even, or do some of them use their prestige to earn a little extra money?