Only storing money in bank is not so give us an advantage, becouse the fiat inflation will reduce the value of it, if we save fiat more longer the value will more reduced. may be just save some part of our money in bitcoin is a good investment to grow our fiat. but doing bitcoin investment could make our amount of bitcoin grow. although there are always a risk. I preffer like to change 80% of my money to gold, 10% to bitcoin, 10% to fiat.
Why in the first place you will store money in bank just to expect great profits from it? Try to asked some question in people around area that uses bank if that is their main purpose.
It's for saving purpsoses since fiat currency is stable. Also fiat currency needs many years before the value of it will reduced. And even it will reduced retail price of products will go with the flow so still it's 1:1.