Why shouldn't you? BTC is still very young with much more potential like other cryptos. Maybe not right now is the best time, put I invested when BTC was at 5800, and now its over 14000. So I made a pretty good profit from what I put in.
If you are going to invest, wait until it reaches a low. Then you could cash out once it gets high again, or do what I'm doing and having money in BTC for a very long time.