This must be at least the tenth time you've asked this, Henry!
Investing in any form of cryptocurrency is effectively gambling. You can make big gains but, equally, you can make big losses.
Bitcoin has been a fantastic investment (= gamble) for people over the past year but many experts fear that the bubble might soon burst, with it's value crashing down dramatically. So there's a hell of a risk involved in investing in it.
There are many other cryptocurrencies which you can invest in. If I was going to chance my money in such a way, I'd steer clear of Bitcoin and invest in either Litecoin or Ethereum.