Is important to control losses and control gains, when a coin gets a big pump is worth to take atleast some profits, that way you are assuring some profits and potential get more cheaper and at the same time ride a parabolic price rise too, is a win/win situation in my opinion and more easily controlled. One strategy alot of investors do is when a coin gets pumped crazy or is a ICO that give insane 2/3x returns they take the initial investment and let the rest ride, that way you are only playing with profit and you dont get too emotional attached
Thanks for the comment