Despite the fact that I might not be a rich man in this country, I am a very rich man in this world. I feel quite lucky and grateful to have been born in the USA. But to be fair, that was not a very good wage for where I live.
I think it's quite likely, but unknowable, that folks would accept the income:cost of living ratio of the US if it came with the associated sociological benefits. I think you're underestimating how disproportionately impoverished many people around the world are.
Except that the Chinese person is a prisoner in their own country, and the American could move to China to have a higher quality of life outside of the polluted cities.
You're right that a few people do, although I think most people realise how deeply fortunate we all are to have won to at least some extent a genetic and [entirely separate] geographic lottery.
I upvoted you because at first I decided you were a king writing this and telling us to feel more lucky and I felt angry, but then I pretended you were the poorest laborer writing this and telling us to feel more lucky, and I agreed.
I was thinking about people moving to the US and working there at an Amazon warehouse.
If we talk about working for that rate in their native country, I think it can be up to 5 billion. And a billion more will take the job without being too happy.