The $5.61/oz includes costs for farmer, packaging, wholesaler, retailer etc etc. Let's assume that most of the cost of the retail price is production. (I don't believe it but it's late at night and no one to call.) Let's play with the idea that it costs $5.60/ounce to produce oregano. (The numbers are pure serendipity. Honest.)
$5.60 per ounce to produce oregano
$56.00 per ounce to produce marijuana
Make sense to you? Am I doing the math wrong?
Why should there be such a huge factor (ten times as much) between producing oregano and producing marijuana? Not saying there isn't; the consultant is a reputable one. But commonsense says otherwise that weed is so expensive to grow when you strip out all the illegal aspects.