I don't have that much money but I wouldn't dare to invest everything in Bitcoin. No matter all advantages it's still risky. But I'm trying to enlarge my portfoliobit by bit and with time to have some decent sum in my wallet. To my opinion it is always good to diversify investments.
And that is the way it should be done, if you dont feel comfortable with the risk associated with bitcoin then investing just a small amount is the right choice.
The future of bitcoin is unpredictable so we cannot afford to invest all our money in it as if anything goes wrong in future then it will surely make us to loose all our investment at a single point.