Djanaba: You should have read the master promisary note. It says specifically, "I must use the loan for authorized educational expenses... Authorized educational expenses include the following: tuition, room, board, institutional fees, books, supplies, equipment, dependent child care, transportation, commuting expenses, rental or purchase of a personal computer, origination fee and guarantee fee, and or other documented authorized costs." So investing, gambling, drugs, vacations, ... are not supposed to be paid for by loan money. Despite this, many students do use their "extra" loan money for these activities. The financial aid offices do not check up on exactly where every cent you have is coming from or going to. So don't worry about it.
Also, I KNOW that my total repayment amount will only be 133% of what I borrow, not the 200-300% someone stated. Meaning, for every dollar that I borrow, I will pay $1.33 at the max of 8.25% interest. Of course, I will be able to make my payments on time and within 10 years. Also, I should be able to repay it in less than 10 years after residency. You can also think of it as less than that in todays money due to inflation and interest write-offs on your income taxes.
You people should stop worry about your loans and how much in instituational aid you can get and whether or not the school is shafting you. You'll still get up to your schools budget in loans (not necessarily grants and scholarships) and once you are done you will not be starving on the streets.