Unlikely Investment in company or other things like assets the currencies large liquitity pool globally can be best way to invest for good profit and it's safe and Im sure rich people bought the dollar early and sell it when price of dollar high
There are decentralized cryptos and cryptos are digital, so space is no problem no matter how much money you put in here. This also makes them secure, in a way that the people outside or on our nearby won't see them but if let say they have a physical appearances, I think that can lessen their positive impression.
Another reason on why they are the best is the fact that they are currencies, so we can also spend them easily just like a normal currency. This is something that a regular investment asset can't do but before we can use them, we need to convert or sell them first and that can still take time. Indeed that fluctuation in fiat is tied in inflation but fluctuation in cryptos are more than that.
One example is the demand and supply, the news, fear and greed index, and so on... If about profit making, we can achieve it by selling at the pumps and not at the dips but selling at the dip might help us to save the value of our investment.