Greed is not absolute, you can't make a judgement between whether something is greedy or not, but that does not mean greed does not exist just because there is no line. That's not a problem with defining greed either, there is no absolute, it's an aspect to take into consideration when defining anything.
Greed is not an individual trait either, as many other things become involved as well. There is not linear chart between greed and generoisty, therefore I can't mark any answer somewhere between being generous and being greedy. It would generous if the village shared its food, but that does not mean you're being greedy if you refuse.
There is also responsibility to consider. There's this story called
"The Ones who Walk Away from Omelas" by Ursula K. La Guin. In it, the narrator describes a world where everyone is happy. Everything is prosperous, everyone is healthy, there are no problems. The dark side of this world however is that there is a solitary, unkept closet in a basement of a random house and at one time for every child growing up on Omelas, they have to visit the child who lives inside. The child is force to live off disgusting food abd sit in its own feces, and the worst possible conditions you can imagine someone to be in. No reason for it, just know, without that child there, Omelas would not be the prosperous place it is.
If you ignore your responsibility to justice for your own gain (note, justice also has no absolute, it is perception as well) then you are being greedy. If you have the power to help someone, then in my opinion, it's your responsibility to help them. You have to pick your battles, yes, but injustice cannot stand. No government nor community can survive off the pillar of human suffering. If you ginore the suffering, you are being greedy. Just so Channler can see what I meant in Parliament so long ago, this is what I believe about responsibility. Bush had the ability to help, and since he didn't, he shares responsibility for what occurred to the victims of certain tragedies he could have prevented.