Most of the time greed is not working for the trader or even i can say all the time, because greed in trading can lead you to loss. If you can get profit even it is small though, you should get it but even you are greedy and want more and more . As a result there will be more chances for losing that money.
Yes, greed will lead you to be late to take your profit which you have already seen before, because you want more profit but that will not always work as you want. Once you become greedy, you can not see how long the price has already increased and need to adjust and make a correction. And when the price starts going down, sometimes the price goes down deeper, makes you panic and sell at a low price, lower than the profit you should take before. That will make you regret making a wrong decision.
this has happened to many traders, because it is a common problem for a trader. and strangely enough, sometimes we still do it even though we really understand it's not good. and to fix it, it must be from the personal inside of a trader himself by applying high discipline, to be able to comply with the previously analyzed plan.