For me, when it comes to altcoin profits, being greedy can cross the line when you let FOMO (fear of missing out) drive your decisions instead of sticking to a strategy. It's crucial to set realistic profit targets and know when to take profits. If you keep holding out for that extra bit of gain, you might miss the chance to secure your earnings and risk the value dropping. Greed becomes too much when it blinds you to market risks and stops you from making rational decisions. I think it's better to take steady, smaller profits than to risk losing everything by aiming for the moon every time.