I think Greed in one of the those features which r engrossed into humans by birth itself. Because it's very difficult to find anybody who is not greedy these days & the best example of this i can quote is Indian RTO Police.
greed become as a human tendency when he faces partial fulfilment in his early life
and the expectation becomes unstopable. it becomes as a pschycological disorder.
all natures of human are beautiful and wonderfull untill they overflow beyond its thershold.
Some term "Greed" as a need for excellence, to climb up that corporate ladder quickly, or some believe that it is a rat race where one has to be quick, crazy, and use any means to reach your goal...
Humans have a different approach towards achieving something... But the fact to be seen here is 'will the desired approach be fruitful"... Here your intent is questioned?