Forget squeezing millions from a few megahits. The future of entertainment is in the millions of niche markets at the shallow end of the bitstream. In 1988, a British mountain climber named Joe Simpson wrote a book called Touching the Void, a harrowing account of near death in the Peruvian Andes. It got good reviews but, only a modest success, it was soon forgotten. Then, a decade later, a strange
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