The idea that greed is natural or you must be a saint to live without it is based on a flawed notion of human psychology. Its like saying "well, there will always be war, so we might as well fight." Having such an attitude is exactly what allows wanton wars to exist in the first place. Greed exists in the current world because it is heavily incentivized. The financial markets, for example, are places where people of otherwise modest talent can make large sums of money very quickly. But how do they get this money? Ever seen wolf of Wall street? They don't get it by offering goods and services to improve the lives of their clients. They get it by being greedy, from which they justify all manner of lies to get more and more money. This is not a natural state of affairs, it can only exist so long as it can be sustained. Stock exchanges are an invention that is at most hundreds of years old. Most people lived and died without ever feeling the euphoria associated with greed-based gains.