Austrobogulator: Have you seen this image?
>Kids love brown-haired 30-something white males.
Don't they? It's basic math.
Suppose you are given $100 to bet on the outcomes of a test, distributed however you want. You know the result is A 60% of the time, B 30% of the time, and C 10% of the time. How should you distribute the money to maximize expected winnings?
Why, bet everything on A, of course.
Now, whether making the protagonist the most generic person imaginable is financially viable and/or ethical is another question entirely. But to the extent that physical resemblance + apply filter: adulthood + apply filter: physical fitness are the easiest-to-satisfy criteria for identifiability when you're trying to sell your pitch to the suit / win the blame game, it is the correct solution.