It is true that, nowadays, you can earn money by trading some bitcoin. However, by its nature, bitcoin is not something like that at all. Satoshi Nakamoto, its creator, has invented the system of block-chain as a way to make it possible a peer-to-peer payment system on the Internet without third-party organizations. Thus, for bitcoin to be a pioneer of a brand-new social model or to be something revolutionary, we should SEPARATELY consider bitcoin (and other virtual "currency") and currencies issued by nations.
If you dont consider bitcoin as a potential to earn money, I think you have not fully understand it's great potentials. I advice you to do more readings and research about bitcoin for better undertanding.
Thanks. You are right in saying that bitcoin has a potential to earn money. But what Im saying is that bitcoin is not only a way to earn money. What makes 1BTC much more than $1, while 1BTC is just digital data, can bring a great change into our social system, which is based on bank capital.