I get that private loan rates may be lower if your credit qualifies (or with a cosigner). Yes, my family will help me out if I'm really dire and needed to put down a deposit in school, but they're not going to pay my student loans and see their credit go in the crapper because of me.
Private loans will demand that you pay an ex amount to them regardless of our income, etc., and the payment terms are therefore inflexible as opposed to the federal loans (10 yr forgiveness if in a public service job, IBR/ICR, etc.). Discover and
Sallie MAe won't do that for you. All of these loans are non-dischargeable as well, so god forbid you had to file Chapter 7 or 13, these loans are still on your backs after discharge unless you are paralyzed and can't work for the rest of your life.
Granted, the MBA market looks better than the JD market, but given how uncertain job prospects can be, I find it best to have the most flexible payment options are available. I don't intend on going $300K in the hole, but I don't want to see the worst case scenarios pile on me and hear
sallie mae come knocking at my door if I can't pay. They make a killing with college students who choose to go to private or out of state public universities, because their parents will only pay so much (EFC), and the students can't borrow federal loans to cost of attendance. Only mom and dad can through PLUS. So the student must use
Sallie Mae or go to a cheaper institution (through financial aid and/or tuition price).