Obviously greed and ego are brothers, but they are definitely not the same thing. Ego can be satisfied at a point. Greed always wants more. In a way, greedy players can never win because they are never done. If there is more that could possibly be won, they keep going.
Some players make a horrible mistake by trying to win every pot they play.
Wanting to win this pot is senseless, wasteful, destructive greed. You ought to take a cold shower any time you sense yourself doing things like this. I m not suggesting that players should not want a lot. Go after your share, try to make it a bigger share, but make sure you know how to share. Fortune favors the bold.