So, if King bounty is inflated since he is a Lunarian, dont you think it still speaks about his power? I mean, it aint inflated because of the name of his race, the race itselfs talks about his power. Being a Lunarian will give him some extra coins but it justifies his threat, being damn fast and durable.
Even in Queen's case, he was not just part of Mads, he created weapons due his knowledge and is dangerous for it. So their bounties aren't inflated, it just shows how dangerous they are.