growers have had pipe dreams of opening dispensaries and dumping their excess product on to them for eons. growers always know unemployed people looking for easy work (trimming, selling bud).
if not from the growers own fascination with marijuana the dispensary gets off the ground, then it is the John Doe church-goer who has wanted to be Scarface or any individual who is aware of the obvious profits in drugs. Then to be able to do this with a shred of legitimacy makes it seem even legal.
I find dispensaries to be a terrible solution to the problem of providing better access to high quality marijuana. The nature of "everything" makes it so that anything more than a small amount of one strain becomes excessive to own, or difficult to procure, or difficult to sell. As a dispensary you are charged with keeping lots of product and lots of variety. You buy lots of good-and mediocre weed. Then you pass off those buds to the customers. The problem is that the very buds the dispensaries are getting are just rejected buds really. It is so rare for dispensaries to actually sell their good stuff. It is more often than not sold out by bogarting it for themselves and close friends. So that original 2 ounce is gone before a customer is even looking at it. Most dispensaries seem to be big fans of purchasing 2 ounces of one strain at a time (in Michigan).
So the point being is that the product is so constantly moving that even if you like XYZ by the time you visit again it is changed up, and with the odds stacked against you there isn't a good chance you will even buy something truly amazing. There just never is enough good weed...