Will in that case were value increases up to 200 percent over a night it is already a huge amount and a opportunity to gain high and profit opportunity as well. But in some other ways it can be also sell half of your holdings because it might be also in the next days to come increases is reach up to 1000 percent.
Well as for me, I don't have time to be hypocrite. If incase my token will increase 40%-200% in value, then I would totally sell all my tokens. It's just rare to happen, so why would I just ignore it? And I don't care if it increase again by the next day. Its enough for me to earn such huge amount of profit. And also, if it increases that huge percent, it is expected that it will automatically decrease in the next day.