OK, semantics get tiresome pretty quickly for me. Also I did not attribute "greed is good" to Ayn Rand, rather the long quote that Gordonium pasted without attribution.

From wiki: greed = "an inordinate desire to possess wealth, goods, or objects of abstract value with the intention to keep it for one's self, far beyond the dictates of basic survival and comfort".

Obviously my analogy was to point out that a child has to learn not to take more than they need. I don't think it's much of a stretch to apply the analogy to the rich/greedy?  Is it good that we have people who could spend $100,000 a minute and still not be broke by the time they die?

I would think that greed is inherently counter to self-interest, so let's not bother trying to equate those terms.