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wedrifid comments on Human performance, psychometry, and baseball statistics - Less Wrong
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I suspect it's a selection effect. If a task can be effectively mastered with a short investment of time (like your example of 50 hours), then it's not something you can turn into a career. If a task can't be mastered in less than some large upper bound of hours (say, around 20,000) then it also can't be turned into a career. Tasks with a mastering time of around 10,000 are the ones that are pragmatic to specialize in and establish comparative advantage, so they are the ones that abound.
It may also be a point around which diminishing returns become excessive due to the approximate limitations of humans.