Well, buying bitcoin at the dip moment is lessen the risk and giving a higher chance to the investors to make a good profit because the possible change of direction from dip into pump  up is  at hand. This is the normal cycle of crypto currency is working in the market world. Of course do not expect too much, never forget that crypto is volatile, thus anything is possible but atleast if you invest bitcoin at dip time you are in a good position that will avoid the biggest lost.