Conclusion: I feel that greed is one problem in trading that can actually lead to unexpected losses. My advice is that, as a trader, always take that profit you have made. If, for example, you entered a position and it's really going in your direction, if you have seen a +$100-$500 profit, it's better to take it first.
Everyone that trade knows it's better to take the little profits first but still people still let greed play on and at the end, what they encounter is just loses and nothing to show for on their trading session. Greed that affect human is not only tired to trading as we experience this in almost every thing that we do, from gambling to even our daily life it's just like a virus that's really hard to get rid off.
Some people are just greedy when it comes to money or other important things like sharing things with others.
Moreover, like we all know that it is better to take the ones that you have seen first before hoping to take the ones that you have not seen or even sure of.
Traders are putting them self into big risk when they trade, and as a trader you must have the mind to endure loses just in case you lose and not gain back.
Some traders have goals and they just can't let their goals stand aplace just because of small money that they see, but taking the little ones like twice or 3× will be more than what they have set to get.