I'm not a marijuana consumer -- never have been, never will be. But, I understand business planning and marketing. Marijuana is a retail product for recreational consumers. For most users, it's not a staple item (after all, it's "recreational" remember) so, they don't always plan ahead. Impulse sales, product expertise, advice from local sales staff, and immediate fulfillment are paramount. Mail-order may be a complementary channel for some users, but it won't be the only channel. The idea it can be, is simply a non-starter.