Greed is a very real emotion which can be used for good or evil. When it is the factor which motivates a man to develop life saving medicines or technologies, greed is good. But when it motivates other men to take the lawful earnings of others, to grab personal power via corrupt political office by buying the votes of fools, greed is evil.
Money is neither good nor evil. When used for good, money is good and when used for evil, it becomes evil. There is no more evil on earth than the enslavement of human beings in the name of a greater common good. There is no greater common good than individual freedom itself.