Still, there are some rare circumstances where greediness becomes a positive action. Greediness don't stay in the negative side forever, it sometimes fill out the postive side even in a small portion. For example, being greedy soth knowledge. But yeah, as you've said, greediness will really lead us to bad consequences.
Thats pretty much unrelated with the main topic. The thing about being greedy is that you never feel that you had enough. If you feel that you had enough then you wont be greedy anymore. In the end it is something negative, you might feel that you didnt have enough but actually you already had enough