Investing in bitcoin is a risk, as the value can crash tomorrow.
I'm holding too so far, I believe in what bitcoin represents, so I'm taking the risk. Don't invest more than what you can afford to lose however, but if you can, you should buy more.
Also have a look in other cryptocurrencies.
I agree. But, I think depending on the trend, it may be both risky or at the same time, a smart move. If the market trend dictates that bitcoin prices are stagnant, or worse, going down, then holding would not be a good move to do because it may amount to a loss on your part, especially if you used money to invest, and you have purchased an amount of bitcoin as an investment, then it would certainly be a bad idea to hold because it may go lower than how much you bought it for. But, if the trend and market shows that bitcoin is gaining and would continue to do so, then it would be a genius move to hold on to it waiting for the proper time for the price to stabilize to get rid of them for more profit.