Webster defines greed as having or showing a selfish desire for wealth and possessions. It doesn't say "a lot of". It is not about the amount. It is all about the desire of my heart and if that desire is for my own benefit, my family's benefit, my peace of mind, my easier life, anything me-focused then it is greed and greed is sin!!
I am GREEDY because I am always focused on how I can save money, how I can make more money, how I can sell something.... focused, focused, focused on MONEY....one way or another I am focused on MONEY and it's affect on MY life!!!! This is GREED because it is all about I, my, and me!!! My focus should be on GOD, you, and them!