The lesson I got from looking at all these influential people is you can be exceptional in your field but if you do not know how to manage your money you might just die penniless. I personally do not want to pass away after suffering from poverty. I want my last days to be spent in bliss..
Let me focus on the moral of the lesson rather than the validity of the information. It is important to avoid a careless lifestyle that could lead to the waste of resources. Gambling, drugs, and other forms of addiction could lead to wasteful spending. Living within your means is also good to avoid debt. I prefer to live a modest life rather than spending on luxury and being indebted.