You should know that in yourself. Greed is really hard to control. Greed can lead you more addicted to gambling. So i suggest, if you cant control yourself get out from gambling. Also you will just end up lose in the end.
knowing it by yourself you should prepare things first before gambling as many of us here also have this problem we should limit ourselves, placing small amount as a capital and aimed just little winnings then stop we should practice this in order to control greediness its really hard but if we master it from time to time we will able to gain from it.