REUTERS/Mike BlakeSilicon Valley's tech elite don't define their status with the typical trappings of wealth. You generally won't find Tim Cook, Jeff Bezos, or other billionaire tech execs sporting expensive tailored suits or Rolexes like their high-powered peers in the rest of corporate America. Instead, they signal their membership in the elite another way — with expensive sneakers and luxury eyewear. The sunglasses of Silicon Valley are taken out of their cases at least once a year when the who's who of tech elites descends on Sun Valley, Idaho, for the annual Allen & Company conference.