But that's the thing, it's not about "more melanin", but rather about something like: The grass on the other side has a different amount of melanin be harder-t

But that's the thing, it's not about "more melanin", but rather about something like: The grass on the other side has a different amount of melanin be harder-to-achieve and thus more desirable because it previously signaled belonging to the higher socio-economical strata.