You make it sound very simple, but honestly it is not. Like one of the user here said in their reply, precious metals like gold, silver and so on could have changed their lives if they invested in those early. But they didn't because only a small portion of the people in the world were able to invest early in those metals to make them rich. The others didn't have any surplus money left with them to be able to enjoy any kind of investment. It is the same in case of bitcoin. They weren't able to invest in bitcoin because they are living form paycheck to paycheck. Moreover, bitcoin and other crypto currencies are extremely volatile. And there is a saying that invest only what you can afford to lose. Someone living from paycheck to paycheck cant afford to lose anything.