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.
It's a matter of choice, some people understands that crypto market is highly volatile but they prefer to old for long term and to say the truth many end up achieving their dreams this way, HODL isn't Greed, BTC price in 2017 ain't the same today that's why HODL is a good long term strategy