Right but if that's all it can be used for, it will eventually settle into a value below its equivalent dollar amount. That is, the amount of bitcoin you'll get for $100 will buy some fraction of the meth that $100 will buy. It will probably be close to 1:1 but that discount rate will be the only actually important question. The limited utility will function as a capital control, so it will be like Bahamian dollars.
> Right but if that's all it can be used for, it will eventually settle into a value below its equivalent dollar amount
That I agree with actually! Part of its utility in being used for drug purchases comes from the other uses for BTC meaning that theres liquidity. Without that, it's still useful for black market transcations, but less useful than it is today.