Inner freedom means freedom from compulsion. Temptation from within exerts as much influence over the spirit as force from an external power (government, corporation, etc). Our culture of mass consumerism propagates psychological dependence on objects on a massive scale. From an early age, American culture teaches us you don't just don't want money and fame, you *NEED* money and fame. You need a job, you need a car, you need a house, you need to own your own business.
People on Wall Street don't want want private jets and yachts, they *NEED* private jets and yachts as surely as the heroin addict needs his next fix. Junkies will sell all of their furniture, financiers will trash the entire banking system; anything for a fix.
And greed only propagates one species of temptation. There are plenty of others, like dependence on our identity and sense of self. That *NEED* can drive behavior just as strongly as greed and drives much of America's excessive partisanship.