I agree with you on this if we invest in a certain coin and have hit our profit target and greed increases so we can't sell and always think the price will get higher. But in fact, for that reason, I always force myself to ignore the best prices to sell to make a profit for myself. And myself I have known this for a long time, but I have also fallen victim to greed. Greed is where day traders on the floor become losers.
Greed will always be around us so it will become harder for us to controlled it. But if you are an experienced trader, i know you will not fall into that greed most of the time because you know already that prices won't stay on top at a long duration. Only newbies have troubles in controlling their greed since they always think that once the price is already in a high price, it will even go up higher, expecting more huge profits to come. But the market is not like that. There will always be price fluctuations when we least expect it so prices will definitely fall back. If we become more greedy, then there will be more chances of losing that will definitely make us poor in the end. Well, greed does not literally mean that it will pull you down making you poorer, sometimes it will also push you into more profits that will make you instantly rich.
