Some people refuse to take profits when their coins and tokens are surging so high.
Because greed let people keep on waiting for higher and higher value for there coins and end up selling at dip.
Since price can’t go up all the time.
Valuation will not be going higher all the time but anyone who invested wants to get the best profit possible and they do not want to miss out on the profit they could earn and so does many would end up loosing if they invested in a hyped up coin without any fundamentals. So if you are investing in something make sure you learn about the project and their development.