It is tangent to the question but there is also a related opportunity cost to delaying starting a company. At some point putting it off, to borrow a Buffett-ism, is like saving sex for old age. Many of the world’s most eminent companies were started by inexperienced and/or first-time entrepreneurs. More importantly, you have much more to lose when you have a career, paycheck, reputation, family and mortgage than the proverbial ramen-eating student. Of course many make it happen, but sadly the corporate rank and file is rife with tied-down folks who get stuck on a treadmill or regret not chasing their dreams.
Rhetoric aside, most successful entrepreneurs I’m aware of either explored their idea and market carefully, or toyed with a side project that happened to show massive and unexpected early promise and only then evolved formally into a company (Facebook, Google and many others fall into this category.) Few were truly “leaps of faith”; entrepreneurs tend not to seek out risk but are rather comfortable with uncertainty. -Drew Houston, Dropbox