Sarah Berger, Bankrate's "The Cashlorette," discusses a new survey that shows that over 44 million Americans have side hustles, with millennials making up the largest part of that number. What are they paying for with that extra money? Regular, every day expenses, including student loan debt. The survey showed that while baby boomers make the most money with side hustle, it's millennials that are hustling more (harder) than all other demos.