Bob Parsons ambles up to the first tee of the 18-hole course at his lavish, multimillion-dollar Arizona golf club, Scottsdale National. The stocky 66-year-old is wearing a pea-green shirt, untucked, with “U.S. Marine Corps” over the left breast. In his left ear is a large black earring that’s etched with the letters “PXG,” the acronym for his golf equipment brand, Parsons Xtreme Golf. He tees up his ball and turns to his playing partner for the day, Ryann O’Toole, a 30-year-old LPGA pro who is sponsored by PXG.