That creates an environment where being a slaver is rewarded, and therefore not being a slaver was punished.

Idk about this line of reasoning. One thing being rewarded doesn’t necessarily mean the absence of the thing is punished. An olympic race has a winner and the winner is rewarded with a medal, but the losers aren’t typically punished, they simply “aren’t rewarded.” It isn’t like you get put in the boo box for coming in 4th, and I wasn’t there but I doubt they put anyone in the boo box (or any “punishment”) for being “a doctor not a slaver.” (Dammit Jim. Couldn’t resist.) At best some slaver dad got mad his kid wanted to be a composer instead of take up the family slaving business, but what else is new?