Should not, because their prices are constantly fluctuating, until you retired perhaps the BTC is just a pile of debris, no longer worth to sell so you will lose everything.
For the short term I admit that it will be risky due to fluctuations, but for the long term, I don't think so. the development of bitcoin shows a positive thing many people around the world are interested in using bitcoin and that is the key to the future growth of bitcoin prices that will make you profitable..