At the moment, I have a client outside of work (ReactJS stuff), and am negotiating a remote gig with a company in California.
I agree that exotic technologies give you a leg up.
My stance is also that, if you're pushing for remote, then by definition you need to justify why you're a better choice than your remote competition who may live in lower COL areas.
If you're remote, then why should someone pay you a high salary vs. paying a lower one to that bright guy in Romania, who can still live like a king?
That's where marketing, differentiation, and service come in. But these are just my guesses.
Everyone has a plan until they get punched in the face.
Companies will pay a premium to have someone in the same timezone who speaks the language fluently.