I did the math and based upon setting up a commercial grow in a 1,500 sq.ft. building I figured I could net about $400K/yr assuming each plant only produced 2 ounces per harvest, which is pretty conservative. There are are a lot of factors that if done right could boost plant production to 5 or more ounces.
I imagine if it sells for $250 an oz on the street, the buyers for the manufacturing plants will give you about 1/3 of that. They are carrying the liability insurance.