I don't know if I can quite get there.
If the dispensaries are limited in their supply (either through law or lack of a vetted supply) and demand is there then it could be possible to still make something of it* -- I am sure we have all seen things in south America or whatnot where supplies run low and prices shoot up relative to elsewhere. Couple that with a proper crackdown of illegal sources (you are no longer ruining fun but ensuring safety of your citizens too).
*long term, last hurrah or short term is a different discussion.
I don't know what regs there are for purchase their either -- back when California was doing the medical card thing such a thing could be brought up by employers, divorce courts... and this lack of oversight provided an in for some dealers that obviously were not bothered by such regulations.