Probably for the same reasons that "If you can consume the mold colonies, who'll buy their pills?" And "If you can consume willow bark, who'll buy their pills?" and "If you can consume foxglove, who'll buy their pills?"

I have the answer: people with at least a modicum of "rational" to go with their "self-interest". Those people.

(I also have to say, whenever you see a claim that implies molecule X can magically target only cancer tumor cells, the proper response is "bullshit." It might be somewhat specific for some tumors. Might be. If you're lucky. What it's *actually* specific for, nine times out of ten, is rapidly dividing cells. That's why the hair loss, the GI troubles, the decreased blood cell counts, etc. etc. associated (to varying extents) with most broad-spectrum chemotherapeutic drugs. But that's science and physiology. Flower molecules contain magic flower energy, and are not subject to the usual caveats. They also automagically modulate the dose, because all plants of a particular type have the exact same concentration of various chemical compounds. And anyway, chemotherapy doesn't depend much on getting the dose right. Yup.)