Well that is a good advice mate, sell the bull buy the bear is yet simple and profitable strategy, but the problem is that investors has a different strategic way of getting profit from thier investment, i think they have limited thier time on when they are going to sell or hold the coin depending on the development of the particular coin that they invested, even if most of the expert says holding is good but there is still a risk on holdings because there are a lot of coins that turns into very low price after few years of holding and that becomes a waste of our time so we need to be careful.