Bitcoin is not only one of the most profitable investments. It's the most profitable given the risk. It has the lowest risk:reward ratio, and that's why we all keep bragging on how neatly it serves as a store-of-value. People should put their money on what gives the highest return, with the lowest risk. There's no better option than assets with no counterparty risk, like Bitcoin.
I am totally agree with you that there are no option that give us a healthy return except bitcoin yet. We have run many days with btc from where btc was nothing now it is the wealth and asset for the crypto community. Not only this community bit also its getting more popular to the world. If we think about gain so far there are nothing to this world can compete with btc. This is high return from any other investment. Now the thing is that how much we still believe it. We need to be more patient and hold our nerve after investing on btc. Surely it will be given us expected reward. So it can be easily said btc is the most profitable investment year to end so far.