No, that is the exact opposite of what I said. Instead of wasting resource on criminalizing the supply size, make the demand plummet by providing more enticing options. If there is demand for the drugs, you have already failed and criminalizing the supply is a non-functional bandaid.

On the other hand, sure, regulating and ensuring tax revenue comes from the vice is not a bad idea (and it works ok for gambling, alcohol, and now pot too).

This seems like a recipe for an even bigger black market, and various other issues that will come when an organization is running illegally, because of unblocked demand.

Obviously, even in cases where it is illegal to both buy and sell we still have black markets, but making it ok to buy but not sell seems like a recipe for a giant black market.

True, but that's an argument for regulation