And I'm pretty sure that teachers and educators in schools/kindergartens get shitty salary...
Depends on the school. I know people in Myanmar on low six figure salaries for teaching in primary schools and that's before all of the other perks such as housing and relocation expenses. 40k is a lot, but like it's been pointed out most of these fees are covered by corporate packages. Singapore has a number of good schools so maybe it will only be 20k a year.
I'm scared to look back and see what this thread devolved into after the few posts on this page.