Buying as much as Bitcoin at current price is long term investment. Buy and then just forget you have them. Lol. I mean after buying coins, just hold them until the price is is above 500+, 1000+ is even better.
Does it have risk? Of course! every investment has its risk, it doesn't matter whether you invest your money on Bitcoin or other currencies, there's still risk. It can't be 100% safe.
Well if people will take bitcoin as investment, they must take some actions to their invested coins because in general they do that to make profits.
If they will just hold them "disregarding the price" it will just keep them to more losses and that is the risk. Still it's better to minimize the loss. If they will just keep on waiting then the quantity of their coins will not grow.