Everyone is greedy and of course traders and investors are greedy too. People invest in bitcoin because it brings in high profits in a short time that is why they are greedy.
People who hold their bitcoin just to earn huge amount of profit doesn't mean they're all greedy. They just all wanted to earn huge amount of profit for their family and for their future. Do you really think they're being greedy? Don't accuse them as being greedy coz it's not right. There are people whose being greedy and there are people whose not and it's not being greedy but rather it's being wise. Why would they sell it right away if there's a high chance of earning huge amount of profit if they'll keep on holding it.