By Dan Weil Sports executive Phil de Picciotto of Octagon discusses the money flowing into competitive pro sports. Phil de Picciotto has seen plenty of change in the sports business since co-founding the sports agency now known as Octagon in 1983. The firm is a division of advertising/marketing giant Interpublic Group and represents athletes such as swimming legend Michael Phelps and NBA star Stephen Curry. A few things haven’t changed during de Picciotto’s tenure in the sports industry—a jump in team values, media rights deals, player salaries and ticket prices. He expects these trends to con…