Those who are new investors of Bitcoin, they may get nervous when they see some big dumps of Bitcoin and think that Bitcoin may never recover again. For those, it is best not to look at the price all the time. This may provoke them to sell out their investments.
For other people too, looking at the price charts 24/7, is not the right approach if you are making investments. Trading is something else where you need to keep updated about the price as your trade is time bound but for investment purposes, just make up your mind that you won't sell bitcoin until 6 months or a year, depending on the plan with which you have invested.