Altruism/Greed Ratio

Tell me what you think of this:

Society is, as a vast generalization, composed of altruistic citizens and greedy citizens. The ratio between the two fluctuates as a society becomes vastly greedy, and then demands reform due to failure. If a society becomes vastly altruistic, then it no longer benefits the individual to do the same; greed among charity is profitable. As the majority realize this, whether consciously or unconsciously, they shift to greed. Greed among greed fails due to lack of cooperation, a lack of independence from time spent as a parasite, and intense rivalry. Silly analogy perhaps, but it's much like "Friend or Foe": http://en.wikipedia.org/wiki/Friend_or_Foe%3F . Is this perhaps the root of the economic aspect or governing, or am I just generalizing too much?

I propose greed be used for altruism, that is, people are openly greedy, and this force of greed is used for altruistic ends.  Say I start a fast food chain with the purpose of making billions of dollars quickly, and then a good portion of that is used for altruism.  A sort of ethical greed where instead of good purpose with bad results, it's bad purpose with good results.