Diversification will help you in reducing your risk but most successful persons took risks so personally I prefer to take my chances with bitcoin, I'm not going to put all my money in bitcoin or anything like that but I will put a bigger weight behind it.
It is true that those who became successful took a lot of risks to reach there. But at the same time, you should analyze whether you are capable of undertaking such a risk. You need to calculate how much you will lose if something goes wrong, and how you will be able to move on after that.
Yeah rightly said,taking risk is a dangerous thing and depends upon the situation and stage of life in which a person is.Calculated risk is the way to do it and i also believe in divesification to limit the loss.So yes why not both,no need to choose only one.