investing time in bitcoin to gain profit is not a waste of time as long as you will really earned money from it like trading. The real wasting of time is doing nothing and spending your time for a non-sense activity like playing games and by spending your time in social media.
There is nothing else we could gain on bitcoin but benefits. At first, we might find bitcoin too complicated for us to understand, but we'll notice on our way there that it is not that hard, besides it is interesting. People nowadays have trust issues, since scams about cryptocurrency is all over the news, we can't blame them. You won't realize that Bitcoin is capable of helping you to earn more money unless you are going to try it.
One biggest reason why me, and all of us here are spending time on Bitcoin is because of profits, and we wanted to participate in the evolution of this new era, we are introducing to the world this thing called "Cryptocurrency"