[sepin4]

You seem to have some simplistic view of how global economy works if you think all around the globe people should be payed the same for the same profession. Unless you work as freelancer in which case most of the time you have to pay your own taxes(which in most countries will amount to a big percent of your paycheck), you will get salaries according to the local market price standards regardless of what your peers in another country get. There are at least a few reasons for that one of which is that the market would not allow for huge disparities in salaries compared to other professions and to the same profession with local funding. You can try to negotiate good bonuses and/or equity but that is not mandatory and it is as much as you can get.