Greed is fine. People's desire to own more, have more and eventually have more to spend have driven the progress of humanity in the search of faster, better, cheaper, less difficult and less hard. The thing is to use one's greed in the right direction. There are effectively many greedy people in the crypto sphere but they tend to leave as greediness is a sure way to loose massively in this high risk environment.
Greed is what makes a gambler to continue gambling despite even starting his whole gambling session with an ideal target or time he would want to gamble but at his playing everything changes in a split second when the urge to gather more comes into his taught and I doubt that he would even remember even setting boundaries because that quest to acquire more overshadows every other taught in his head and that what's make him lose everything too at the end and then starts chasing previous which can turn him to an addicted gambler.