Too much competition from the local syndicates, or the other small-time dealers, which are also 'protected' by the police, who get cuts, as well as the politicians, who are sometimes the drug kingpins too. Suppliers are usually either Chinese (mainland), Taiwanese, or African. Or 'homegrown' using Chinese equipment/ingredients. So yeah, they're not exactly 'black market' in a sense. Oh well, 3rd World and all of that jazz, where dealing with drugs is easier than dealing with bitcoins.