Also, it doesn't seem like it would be that hard to find someone to accept it as payment, since they can convert it to cash too. And the sort of landlords/suppliers/employees willing to do business with a dispensary seem like exactly the sort who would accept Bitcoin.
"Unsound ponzi scheme" could just as well be applied to any fiat currency. It has all the same rules (early entrants are more privileged in "the game" and can invest to out-perform younger players). It is very odd to hear people applying such qualitative judgments like this when the alternative is a currency that is actively debased by its issuers. Or do you think the inflation we've all suffered under isn't a problem?