What rate of return for a capitalist is not considered greedy?

Update: It is vague but seeing that many use the phrase "greedy capitalist" loosely, I am trying to determine at what point one is a capitalist and yet not greedy. I am aware different industries realize differing rates of return but I am trying to keep it simple.
Update 2: Bill Gates is a liberal. He started Microsoft. Their after tax profit margin is 28.3%. You can use this as a frame of reference.
http://moneycentral.msn.com/investor/inv...
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