It is not that complex actually, you just have to learn more about it and read a lot of information on the internet. Right now cryptocurrencies might not be that popular but in the future I am sure that they will replace regular currencies, but for now people don't really trust the technology. Many years ago when credit cards came out, the majority of people didn't trust the technology and preferred using cash, I still know some people who are like that. So invest in it now before it's too late.