Very interesing question. The difference between Bitcoins and real money is gigantic and it is yet beyond my knowledge but I can give you my insights about it. Bitcoin is a digital currency that means it is more transferable than fiat(real money) althroughout the world with no tax and third party programs that will interfere with the business. On the other hand fiat is a necessity in our current era it is non volatile and cannot be transfered easily throughout the world in just a matter of minutes.