First, you need to establish how the name Kaido directly impacts the reward of his subordinates to answer a question like that. Then it's important to note that calamities have their rewards inflated by their violence and infamous acts that gave them their nicknames, while King and Queen in particular have extra facts that impact their rewards:
- King is of an almost extinct special race.
- Queen participated in the Mads and probably possesses Vegapunk technologies and information.