Absolutely, Investing in a Bitcoin and sitting on it is still good but there are many other ways you can make good profit on your bitcoin. Only risk is that, no one knows the future of Bitcoin. If government declares it as a illegal currency, then the value of BitCoin will become zero or may come down very drastically. Also, no one can predict Bitcoin will grow very high and increasing day by day. Risk is involved in any kind of investment. In fact, you might know one of the most basics rule of investments: High risk, High return.
good luck