The reality is that money lets you "take risks," and money gives you options (in this world). To be honest, I don't think that starting your company with the "risk" that you might move back in with your parents if it fails... is at all a meaningful risk.
Psychologically this is not true at all. It's much easier to take risks when you have nothing to lose. How many 18-30 year olds do you see having a swing at it and trying something, vs 30+ people with families and savings to burn?
There is a sense of urgency (e.g. if I don't do it now I won't get another chance) that counteracts the feeling of "nothing to lose")