[LeifCarrotson]

No. Supply has a geographic component. They may be very rare in the US, but very common overseas. For example, there may not be many people currently in the United States who are fluent in Northern Kurdish, but there are millions of capable applicants available in Turkey, Syria, Iraq, and Iran. Supply will have an impact on the salary, of course. But in the absence of regulation, it will only be what the native Kurdish speaker would typically earn in their home country plus a some amount for the travel requirement.

Edit: This is how H1Bs should operate according to their stated purpose. edge17's link to http://www.myvisajobs.com/Reports/2017-H1B-Visa-Category.asp... shows that it's not being used in this way at all.