Olympic medals haven’t always led to riches for athletes BY ADAM H. BEASLEY abeasley@MiamiHerald.com Tessa Lighty / Miami Herald Staff   Robert Strauss gives a swimming lesson to Walter Ptkovich, 4, on July 15, 2012. Strauss was an Olympic swimmer for Mexico and now gives lessons. Swimmer Michael Phelps is the most decorated Olympian in [...]