My answer to why you should start a startup is simple: there is a certain type of person who only works at their peak capacity when there is no predictable path to follow, the odds of success are low, and they have to take personal responsibility for failure (the opposite of most jobs at a large company).

Doing startups was never my plan but looking at my history in high school and college I really needed to be an underdog in order to motivate myself to succeed. Startups are the classic underdog, 99% of the time - they fail.

Do I like being the underdog?
Do I seek the hard challenges that most people shy away from?
Do I thrive when I take personal responsibility for success or failure?

If you answer yes three times, then maybe starting a startup is for you. The many jobs at big companies cannot offer you this experience.

I cannot promise that doing a tech startup will make you rich (in fact the odds are against you becoming rich), but I can promise that it is one of the most challenging things you can choose to do. It will push you past your limits, force you to learn faster, and maybe show you that once in a while the impossible is possible.