I'm bringing this up here as an advice to my people, or some r people who are still scared or doubting bitcoin investment. All we need is proper understanding on how to invest in Bitcoin.
One of my friend saved money in his bank account for a long time to buy a car. When he was ready to withdraw the money, he got exactly what he deposited. But when he got to the car stand, he was asked to add even more money than he had budgeted. He was surprised because he had saved specifically to buy the car, but when he was ready to buy it, he couldn't afford it due to the high price.
I bring this here, so some people will know how dangerous saving money in bank is going affecting our plan, if that money was saved in bitcoin I believe he would have gain profit that will likely give him what he want, because he saved that money there for a long. But all this commercial banks keep using our money for business without any return. So I'm advising my fellow beginners to stop saving in Naira rather than Bitcoin.
Maybe your friend didn't know much about Bitcoin or haven't heard about Bitcoin. Bitcoin, won't give you that 100% profit always because there are times the value goes down. while banks keeps exactly what you deposited, your advice is not bad but at same time we all need to save both in naira and in Bitcoin.
Since its a long time investment, him saving in Bitcoin is 50/50. Is not guaranteed that he must be profited and if only he understands that Bitcoin is volatile and knows how the markets works. There's a difference between saving in bitcoin and investing in bitcoin and there are also ways our traditional banks works, if only he knows the rules on how its works he would have been profited.