I do agree with what you're saying about beginners, but trust me, if you don't give them all the information for fear of scaring them off, chances are, you'll cop it later when someone actually following your advice plateaus or achieves a poor result and blames you for not giving them the full picture. Just a way of avoiding future trolls.
I'm a carnivorous plant collector. I need high blues, low reds and thus very clean air. It's great - these days, I don't even need to measure anything. Once in a blue moon I'll check salt levels or traces of nitrogen (indicator that worms have taken up residence in the medium).
I assume when you say cash crop that you're talking about cannabis. Not my thing. Lately, I've been experimenting with tissue culture of endangered cacti and using passive hydroponic methods to approximate the ideal ratio for triggering blooming with the intention of seed production.