Did I understood wrong or there is more confuse people then I am?

OK, I can understand there is a group

  1. which thinks to buy low and sell High.
    Then there is a group:
  2. They keep litecoing and just keep checking the price and keep thinking it reaches here and it will go high and high and we will sell it then one night they fall asleep and their desired price come and gone and they wait for another opportunity to catch fish I was also part of this group till a few months back and my day never came so I decide to change my group.
    but I don’t understand the 3rd type
    As they are quite a lot what is the benefit of selling your hard earn coins undervalue? if someone can explain I might sell all my coins