I would imagine it's because they really hate all of us fermenting our feeds and making them stretch further, thus reducing our need to buy so much feed....that hits their pocketbook.
If I'm reading it right, he didn't say not to ferment the feed, he said to add it after the fermentation.
So far I'm not getting the big predatory money-grubbing feeling off of the Fertrell company.
Am I getting that feeling off of some of the feed companies which have jumped onto the coat-tails of Joel Salatin recommending this product by adding brand name NutriBalancer to their feed mixes? YOUBETCHA!