Good questions and honestly I don't know the answer. But from what I have read it takes little or no pesticides to grow successfully. After all it grows like a weed
and will grow almost anywhere. So I would think it would be relatively cheap to grow. With all the potential uses it should demand a good price.
Industrial Hemp was deemed a threat to the Dupont's and other big business at the time. So a scheme was concocted to ban it somehow. This in where the cannabis that makes you stoned comes in.
Make this as short as I can. The powers that be laid out a plan to ban cannabis by conning the American public into thinking that cannabis was public enemy number 1.
It was vicious campaign using the media. Some of the things they said were really racist and cannot be discussed here.
So being that cannabis was such a threat to the USA they lumped industrial hemp in with cannabis saying that no chances should be taken and it should all be banned for public safety.
Here is a short movie trailer that shows the extent these people will go to to get a product of the market that threatens their wealth.
https://www.youtube.com/watch?v=sbjHOBJzhb0
Ironically in World War II they legalized it again when the survival of the country was at risk only to ban it again to protect the wealth and big business.
https://www.youtube.com/watch?v=uTjHKFTmNYo