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.
It's common in human nature. Not only in gambling people will not control their greed if anywhere they get extra money. Particularly in gambling, you should control your greed otherwise, you will get addict to this very quickly. And this greed will make you empty hand at the end of the day. I was also greedy person I lost huge money in gambling some days back from that day I started to control my play now I am bit better I can control my greedy.