well lets face it, if a person is dealing there doing it for the money and they can actually make a higher profit off of low quality comercial weed that they can buy for 300 a pound versus high quality that they may pay 2000 a pound for, by the time its sold for whatever the market will bear its easy to see wich one will make them the most money.
and would agree that there is nothing really wrong with the plants used in commercial weed its just not cared for by taking the time to sex plants, and it is not manicured and dryed properly and just gets compressed into a brick stems, seeds and all, you could take about any strain out there and turn it into low quality commercial weed by using the same methods.