There will always be those that complain, the schooling books never has to worry about those types, they have no ability to learn, they spend too much time not learning.
The idea behind the schooling books is the study guide, not just the books used.
No one has to do a schooling book, only those with desire need apply and those that complain will never succeed in anything but complaining.
I read Dr, Christopher's Book many times and at the end of my schooling I had to do their study on this book, I then realized I did not know this book, I was foolish and picked out only what I wanted to learn, that is when I decided to start a little home schooling so a few select that wanted to know why I came up with my ideas, could have the chance.
"IF" you total up the cost of the books Dr. Christopher's schooling uses for their $5,000.00 course, it would be way less than $200.00 and their $5,000 course is well worth the money. Being a nutrition/herbal or master herbalist is worthless in the USA, you pay for learning not for the glory.