When Joel Salatin says something about agriculture people listen. What he does is special. It's a great thing. He's written books and given lectures around the world. People want to buy food from HIM.
What most miss, however, is that he's doing what thousands of other farmers are doing coast to coast and border to border. He's finding what works for him, marketing it to work for him and selling to a specific market. That's not a bad thing - it works for him. But we're doing the same thing - every farmer out here is finding what works for us, what can we maximize, how can we find a market to allow us to do what we do one more year?
It doesn't take writing a book or speaking at conferences to prove one knows what they're doing. Look at their animals. Are they growthy, bright eyes, healthy looking animals? Are the coats in good condition? Do they appear to be thriving? Then chances are the farmer has a pretty good idea of what to do! Talk to the farmer, negotiate your food.
Remember - food choices mean farm choices. That's a win-win situation for all! Minus the book.