I don't see how your argument gains from attributing the hard-work bias to stories. (For one thing, you still have to explain why stories express this bias—unless you think it's culturally adventitious.)

The bias seems to me to be a particular case of the fair-world bias and perhaps also the "more is better" heuristic. It seems like you are positing a new bias unnecessarily. (That doesn't detract from the value of describing this particular variant.)