The thought or "thought energy" around the emotion of greed is one of "lack." I don't have enough. I need more. More. More. More!
What is the universe's reward for a mindset of "lack?" More lack. More loss. It's an old concept and an old saying. What happens if you squeeze the sand in your hand too tightly? You lose it.
Are our coins like that sand? Crypto P&Ds. Scam ICOs, whale manipulation... These are beyond plain desire. It's certainly greed.
Stay loose and stay appreciative for what you have.
On the other hand, greed is often an important driver behind companies and individuals backing projects they believe in. But greed and belief in a better future aren't necessarily mutually exclusive. Do I want my portfolio to moon? Hell yes. But I also want crypto's and the blockchain to succeed.