When the citizens of the State of California passed Proposition 215, they envisioned medical marijuana patients either growing their own or obtaining it (free) from a caregiver who grew it for them and/or others.
Proposition 215 does not authorize the sale of marijuana for any reason. The sale of marijuana for any reason in California is against state law (felony) and against federal law.
Why is the State of California going against the will of the people and not enforcing this law? You DO believe in the rule of law, don't you?
And even more narrowly, it was supposed to be their primary caregiver.
Under alcohol prohibition, whiskey was available for "medical" purposes. That loophole was abused too.