And those three markets also accept (and even more highly value) stable currencies.
Bring a Euro to any store in Belarus and it'll be accepted at a greater value than the listed exchange rate.
It's simpler than that, currency exchanging costs money. If you're using a foreign currency, then you don't have to pay those fees. If, that currency is even available in your country (in some, using certain countries is prohibited)
Didn't realize how dire the listing situation was there
:-p