According to the Y-Combinator's Startup Guide for Students, startups are not for everyone. The hours are long, the route to success is often unconventional, and it is certainly not a surefire way to make a large sum of money. Roughly 90 percent of startups end in failure. \((Y C\) is an exception; over 50 percent of \(Y C\) companies that are over five years old are still alive). Why would anyone choose this as a career?