A few years ago a tech luminary in Silicon Valley told me about a very serious predicament that at the time only affected around 2,000 people on the entire planet. If you were one of those fateful few, he told me, it was a difficulty that would keep you up at night, staring at the ceiling with worry and constant anxiety. What was this insurmountable challenge? This Gordian knot? This unfortunate predicament only a few poor souls had to contend with? The challenge of being a billionaire, of course.