These rich bitcoin holders are probably just holding their coins hoping to be richer in the future when the price increases. To say the truth 1 million of dollars is nothing nowadays to have a real rich life.
To live well they need to continue holding until bitcoin increases more its price and making investments meanwhile.
Well, its true. There are some people are become rich because of bitcoin, and those people are having a effective way to achieve to become rich. They holding there bitcoins and some of people are trying to invest thier bitcoin for a long peroid of time and for them they take a risk in investing because of the chances that they loss its money but for them they do anything just they want to earned money from investing. So, some bitcoin user that become rich will do to invest money for a long period of time and they will waiting to the price of bitcoin will increase its value, therfore they will withdraw thier money that they invest. So for now if we are going to rich just we need to take bitcoin and do everything for it.