I didn't claim that they wouldn't get involved, just that they weren't involved at this point if your price hypothesis should be corrent. And no, they limit you to between 6-24 plants but not per person, only per person the primary caregiver is holding. How many patients a caregiver can hold varies from state to state. It's you who didn't read it.
The raw ingredients are available for marijuana as well, as both seeds and soil is quite legal. And alcohol and spirits was large scale smugled in from Canada and elsewhere during the days of your prohobition - sea or land. It wasn't just homebrew that was involved.
I don't know what operations count as large scale for you, but here's an example from Santa Fe where:
"A longtime Santa Fe resident has applied to be the second medical marijuana provider in the state. If approved, he'll operate a 2,400-square-foot indoor growing operation somewhere in Santa Fe County and deliver marijuana to the doorsteps of registered patients."
http://www.santafenewmexican.com/Local+News/A-budding-business
It obviously differs from state to state how much you are allowed to grow at a time, i.e. how many patients you are allowed to serve. But large scale operations does seem to take place legally.