“There are 80,000 bartenders in the United States with bachelor’s degrees,” Vedder said. He says that 17 percent of baggage porters and bellhops have a college degree, 15 percent of taxi and limo drivers. It’s hard to pay off student loans with jobs like those. These days, many students graduate with big debts.
Richard Vedder and others argue that it’s not always the college education that causes college graduates to have higher lifetime earnings than non-graduates. Rather, it’s that people who go to college are more disciplined and smarter than those who don’t.
More background here: Why Did 17 Million Students Go to College?