The answer is depend on your financial situation, if you are well-off, you can invest it more, otherwise less than as you can. You can buy 1 BTC or 0.1 BTC or even 0.01 BTC. Of course, if you invest a lot, then get more profit or get loss more. But according to current trends, although the quality is few, but its value is not small, it could be multiply thousands of times.