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I'm not sure that logic is solid. Expats move to Saudi Arabia because they can make huge amounts of money in a short time. Is, therefore, Saudi Arabia "a great country"?

compared to the US, SA salaries are quite low

Not necessarily in the industries that employ Western expats. After all, expats come because specialized labor is required, and specialized labor can command a higher salary. There are also perks like supplied accommodation (and sometimes a car) that lets one direct so much more money to savings.

The important part is the trend. US is a great country today but it was greater a decade ago.

As someone who worked in US and left it long time back, last year was the first time I could hear ambivalent views on US from my friends who work there. They are still in US as they make a lot of money but have started to consider the alternatives.

Fact is they won't move back until they make a lot of money.

How do Dubai, SA, Qatar and similar fit into that picture?