Kim Ki-Hoon is a South Korean educator who is so good at his job and his services so in-demand that he earns $4 million/year (Salary confirmed by his employer).
South Korea is also a nation that routinely scores higher academically than the United States (Which, despite unwarranted stereotypes, is a pretty high bar).
I think there's something to be said for their meritocratic education model. Over here, teachers are paid whatever their union says they should be paid. Over in South Korea, they have a similar public education model BUT private "hagwons" are extremely popular and command great salaries for good teachers. They are also largely responsible for South Korea's academic success.
I think US education could benefit from such a meritocratic system. The best teachers get rewarded extremely well. Those who suck? Not so much.