TLDR; Human wants and needs are two different things. If you only measure things like click throughs, you may end up measuring "wants" and therefore risk long t

TLDR; Human wants and needs are two different things. If you only measure things like click throughs, you may end up measuring "wants" and therefore risk long term dissatisfaction as "needs" are not met. So the idea here is to engage paid human rating crew who will supposedly more focus on "needs" (because they are paid, they will presumably prefer less of garbage/controversial/clickbaits).