When institutional investors decide that BitCoin has been low enough they can come in and drive the price to new heights. While everyone thinks that we are going to 50k they can turn around and sell it short and profit on the way up and on the way down. We are in dangerous territory because I believe they will specifically target Bitcoin and the rest of the alt-coins will follow suit. Definite trade strategy is absolutely necessary other than just buy and hope. That doesn't work anymore.