buying or holding a bitcoin is also a investment and also it has a risk because you spend and risk money just to make some profit and try if your money will grow . you should think twice before investing your money .
I think all investing is risky, but the good thing with bitcoins is that the price fluctuates that much and we have reach the peak of $1,000 and with that amount we can still achieve so it is good to buy now and hold it in the future.
Yes, earlier I made some investments and hence lost my bitcoins by 25% but now due to the price increase I again have 175% ( as the price has been doubled ) . So, yes I vote for holding right now better than investing. Still, investing will get you chances to raise the number of holding bitcoins.
Many people have earned really good by making investments at a smart place, but as of now we are not sure which site is genuine and there is a fear of loosing everything if site disappears in future.