I wouldn’t mind smoking a joint now and then but under the current scheme, with either club membership or home-growing, I’d have to commit to buying a whole butt-load of weed.

Requiring residency to buy is perfectly sufficient to quell tourism, though I think there should be exceptions for people from countries with legal weed because they’re not going to come here to smoke. It doesn’t mean out-sourcing the distribution of small amounts to the black market.