The traits that make Sam Zell one of the world's most successful entrepreneurs also make him one of the most surprising, enigmatic, and entertaining mavericks in American business.   Self-made billionaire Sam Zell consistently sees what others don't. From finding a market for overpriced Playboy magazines among his junior high classmates, to buying real estate on the cheap after a market crash, to investing in often unglamorous industries with long-term value, Zell acts boldly on supply and demand trends to grab the first-mover advantage. And he can find opportunity virtually anywhere-from an arcane piece of legislation to a desert meeting in Abu Dhabi. If everyone is going left, look right, Zell often says. To him, conventional wisdom is nothing but a reference point. Year after year, deal after deal, he shuts out the noise of the crowd, gathers as much information as possible, then trusts his own instincts. He credits much of his independent thinking to his parents, who were Jewish r