The Bay Area’s tech industry is known for its cycles of boom and bust. Startups burn through cash as they skyrocket in size and ambition, accumulating outrageous perks and office equipment along the way. Then they crash to Earth, with nothing but their private planes or massive 3D printers to pad the impact.Enter John Carroll. Carroll is one of the under-the-radar salespeople of the tech world, an auctioneer who swoops in to peddle companies’ high-tech detritus. In 2010, he founded the auction c...