This is why this is an article:
"And when that happens, they come to buyers such as Vance who dry and resell the roots to processors, which pulverize and resell them to natural-supplement manufacturers, which resell them as herbal products to retailers, which market them to health-conscious consumers."
To me, this is what the article was leading up to. The poorest Americans, the most vulnerable Americans, are breaking their backs (literally) and risking their lives (literally) with no benefits, while rich American are buying up the result for health products that may or may not have any real effect for them.
The real story here is that a significant portion of Americans have enough to money to essentially light it on fire on a regular basis while another significant portion is trying to stop from getting kicked off of SSDI.