The market could perhaps grow to 100x the sales volume, although that seems doubtful considering 7% of US adults already claim to smoke marijuana - http://www.gallup.com/poll/163835/tried-marijuana-little-cha.... There's no way it'll grow to 100x the revenue, though. Without illegality driving up the price, its price ought to plummet until it's about as cheap as any other agricultural product, apart from high sin taxes (which don't help potrepreneur profit).