Well, in looking up definitions of greed, one is "a strong desire to get more of something." Which I think all humans experience.

another qualifies that with "more than one needs" which again, in a strict definition of "need" encompasses pretty much everybody on this board.

i know I have everything I truly need right now, so to want anything at all would be greedy. And yet, I am greedily awaiting my siding delivery.

a third definition includes "more than one's share." So it is definitely greedy of me to want to fill more than half of the storage space in my home.

eventually, you reach a point where a person has more than they could possibly ever use (and one would argue enjoy, and yet, maybe just knowing they own that island they will never get around to visiting makes them happy)

i think desire becomes a problem (greed) when it takes away from others or consumes your life. And in that way it does play into hoarding and the aspect of it that is selfish (just as drug addiction and untreated depression are selfish - they hurt those around you.)

but it is it "greedy" to want to keep 700 rubber bands that were on their way to the landfill? I don't know. One could also argue that it is greedy to fill up a landfill with items that are still useful.