[evil twin]

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'Great advantage' is not a necessary evolutionary component, some small sniggly one will do or as the link points out, a neutral one may be do just fine also.

Genetics may be too low a level to be looking at it. There is no need for there to be a direct line genetic component for 'appreciation of art' since it likely operates at the cultural level. We don't have an 'appreciation of german' coded anywhere either.

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Yes a neutral trait will do just fine. Disadvantage is the key to the "survival of the fittest" mentality, rather than advantage.

As you point out, a good many perceived traits in us humans are far more cultural that anything else.