So the highest rated player in the world, 19-year old Magnus Carlsen of Norway, has launched a career on the catwalk. http://susanpolgar.blogspot.com/2010/07/fashion-model-magnus-carlse...
There is no reason, of course, that chess players cannot excel in other fields.Andre Danican Philidor was a composer Vassily Smyslov had a wonderful baritone voice, but failed in an audition with the Moscow Opera, Botvinnik as an engineer won some sort of prize for his work during WWII. Mark Taimanov was a concert pianist.
What would be the perfect complementary career for a grandmaster? Perhaps a rock-and-roll star. Or a champion athlete. (Chess-boxing, anyone?) But I think the ultimate would be an international spy. The James Bond type.