Aug 18 - Michael Phelps has been called a "billion dollar man" for possible earnings and ad revenues ahead, but the most successful Olympian in history says it's not about the money.
Marketing experts believe the 23-year-old American will easily become the richest swimmer ever, far surpassing the former most decorated U.S. swimmer, Mark Spitz, but speaking with Reuters Phelps shrugged off the monetary impact of his success.
Dan Sloan reports.
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