There are lots of rules to be a success trader and greedy plays a vital role.While trading never be greedy. If you become greedy while trading then you can be assured that there is 90% possibility to be a losser.
To be candid, it is very advisable not to be greedy with trades since it can make you loose the little profit you have acquired in attempt to gather more profit.
I have a little experience on being greedy.
But on the other hand, most times being greedy can get alot profits to your portfolio... Especially when speculations/predictions are right, one can change his sell position and even put it higher just to gather much profits and on some cases this speculation enters for the trader on that particular trade.
I've also experienced this but not everytime...
But in all, it is advisable for traders to manage their greed and their corresponding fear index when trading....
Being greedy all the time isn't good.