If that's what you are talking about LLR, then you are right. Western people doing "the same" job as someone of a different nationality may well earn more or less, depending on the nationality of the other person (Qatari or Asian).

But I can assure you that the salary of the westerner has nothing to do with government intervention of the western country.

Asian countries can't even get Gulf countries to pay maids a decent wage. Do you really think that western countries can force Qatar to pay westerners amazingly high salaries?