That guy made tons of money and taught just for the fun of it. Early in the course he asked us (a huge auditorium of students) how much loan debt would you be willing to take on at whatever the rate was if you had an investment that was 100% certain to double in the next year. Then he offered increasing dollar amounts you'd be willing to take in the form of a loan and asked us to raise our hands.

It's an impossible hypothetical, but very very few of us kept our hands up the whole time.

At the end he said he would take as much as he could possibly get.