He is a fool. He's walking the wrong way to proper cultivation.
Any strategist knows to first study their contemporaries. He should spend some time on western forums like /r/microgrowery and watch videos on YouTube related to growing. He should import seeds of high value like from Mephisto Genetics who produce the highest quality plants in the world and get generic strains because people go nuts for what they've heard in rumours. White Widow, Sour Diesel, Haze, etc.
If they wanted to make a killing they'd also process all sugar leaves into hash and sell it as a secondary product for an even higher price.
If he was doing this for himself he'd be able to walk away, he's essentially been fettered and leashed. He is a fool a poor witless fool.