About the concept of greed in the market, I believe that rationality can be questioned and that rationality depends not only on greed but also on altruism and social norms. You follow the path that is the most suited one to you and has a social influence on.

Having said that, greed has nothing to do with the profits you gain. It is rather the reward of the market and your business ideas that pays off and no mater what the people say, it is good to earn as long as you can earn.