Correct, that's why 95% of my wealth are in Bitcoin.

Life is gambling, investing has no guarantee you will earn instead you can loss and the worst scenario you lost all of your money. Bitcoin, altcoins, gold, silver, stock, real estate, business are the example of investing.
If people want safety, just buy mutual funds or debt securities which give fixed return, but there's no way you can be rich if you invest in this one.
The key is invest in high risk and hope one or few of them can cover the other assets, or be greedy on the asset that you confident.