There were some people I knew in law school that lived completely off of student loans. Tuition, expenses, rent, food, utility bills, car payment, etc. They took the max each semester in loans. They walked out of law school (six semesters) with debts around $250K. Add in undergrad loans, and I can see that approaching $500K.
Now, that's stupid. I traded military service for undergrad tuition. I took out student loans that covered tuition, and not much more. I lived cheap. And my student loans were just under $100K.
This is not just an issue of "college costs." It's a problem of too many kids (and families) who max out student loans, taking out far more than is needed to cover tuition, room and board, etc., so they have money for other things. And that is a big part of the problem.