Is business ethics an oxymoron?

Is "business ethics" an oxymoron? Do the dictates of capitalism curtail the positive effects of individual ethical behavior? Discuss.

What kind of business are we talking about?  If I buy something cheap at wholesale and sell it at retail, I'm making money on other people's lack of connections, and I'm not charging the price I paid because I want money.  If I hire workers and then manage to make a million, I'm not going to give them a percentage of the profit because I want the money for myself or my business.  I'm not going to give to charity unless it saves taxes or promotes an image.  The only virtue of business is greed.  Not having greed makes you noncompetetive and stupid.     

The only limits to greed are laws, such as banning the sale of drugs, bootleg merchandise, etc.  Despite laws, people continue to sell illegal goods, because risk brings reward.  Risk can also be hidden in seedy communities or countries that don't care.  If risk isn't in what you're selling, it can be in your practices, such as hiring kids in third world countries who make almost nothing, while you profit greatly in the US.  Greed is a common sense that feeds business.