That's right, but we are not always greedy. We need to understand where the greed is. It is essential to make you rich. If many people are not greedy when the bitcoin increases from $ 1 to $ 300, many people do not become rich. All is the opportunity and the moment, choose the right time to greed.
This is a natural truth that greed is curse but here there are conditions for learned and unlearned people which will result differently. If person is well learned about business source then he can handle any market situations as we know that market factors keep o changing so you must know about necessary measures to take against those for your further survival. So, any person who has a grasp over market knowledge should be greedy for further success.