Further all these premiums are also heavily impacted by bull and bear trends. If i recall the Price of BTC in South Africa had reached nearly 30k USD at the height of the bull run in 2017.
Imagine having paid 30000$ each for a few bitcoins just before the crash in 2017 ! Man that would suck so bad !
I'm sure some bitcoiners with the right relations are living off meeting the demand with supply. Right relations to be able to get the money out of the countries where this is difficult.