Not an easy one.

I would only invest in bitcoin is you believe fundamentally that the concept is sound and will in the long term be profitable for you.

Is it a revolution? Is it just a false direction? Is it the best thing ever or is it just technology proving it can do something, even if there is no need? British train boom or pet rock?

The true answer won’t be known for a while yet. So investing is based mostly on where you feel it will be. Good luck, it’s about on par with roulette right now I think.