Well, no. You don't get to just supply your own definitions to suit your own feelings on the matter.
Worse, your "definition" is not even useful. One can be greedy without taking the fruits of another's work; and one can take the fruits of another's work for reasons other than the simple desire to accumulate more.
Greed is "a selfish and excessive desire for more of something (as money) than is needed."
The key words there are "excessive desire." The word "excessive" is, of course, highly subjective; one man's "excessive" can often be the next man's "not enough."
In a rough sense, however, one can define "excess" as that point where a person's goal becomes accumulation for its own sake; or perhaps when the goal becomes to accumulate more just to have the most.
Still looking for the “White” sniper Phil? Ugh, he was on with Reese Hopkins. That’s an hour of my life I’ll never get back. Reese wasn’t “Black enough” for Phil.