Limiting the number of plants, such as "4 plants, you're good....5 or more plants, you're a criminal"...IS IDIOTIC...so is the "fee per plant" thing.
It should be obvious whether someone is growing commercially or for private use, say when someone is growing 100s of plants it obviously is not for "private use".
By over-complicating things and introducing fees etc. you sure won't solve any drug problems...it would be SO EASY just to say "it's ok as long as it's for private use and not in public" but "commercial growing and selling is forbidden". Is this so difficult?
I am still baffled that now in the US there are two (?) states where it's legal, even "recreational" MJ use including growing some plants..while in other states you can go to jail for it. MAKES. NO. SENSE.