The reality, of course, is the opposite. The most successful people I have known have all started their businesses while their lives were relatively stable. That doesn't mean they started off rich, but it does mean they weren't spending all of their time trying to figure out where they were going to sleep or where their next meal was coming from. These days, it is wholly unnecessary to quit your job or move to SV to make a startup happen, and doing so is counterproductive in almost all cases.