Yes, quitting your job is not the only way - or the best way for many people. However, it's not always possible to start something on the side with a full-time job. In my case, my employment contract prevented me from doing that. And even if it didn't, it would have been hard to find the time between work and family. If I didn't have enough savings, I might have taken a different approach - maybe start consulting or freelancing while boostrapping. But in my situation, I preferred to just focus on my business. I still have the option of doing freelancing/consulting if the circumstances require it. And obviously, I also have to option of going back on the job market if I don't manage to pull this off.