By CCN: There are countless reasons why bitcoin and cryptocurrencies rank among the biggest bubbles in history and the dumbest places to put your hard-earned money. Bitcoin Investors Don’t Consider Volatility Bitcoin return or cryptocurrency return compared to stock market return means nothing unless one considers volatility. Volatility is risk. The fatal mistake investors make is that they look at bitcoin, cryptocurrency, or stock market performance in a vacuum, when they must always be viewed in context with risk. This is a chart comparing 1-year volatility percentages across all investments (and I wouldn’t call cryptocurrency an “investment.” I call it gambling).