I recall him saying that from the beginning of his first publication- he wanted to make sure that he abided by the laws -- to take away any excuse from the FTC that he was breaking any kind of FTC law.
They combed through everything in the book and warned him about alot of the content. He refused to delete it from the book- so they told him, "we can let you keep it in , but you cant mention the name or we will be forced to take action" (in so many words).
After his new updated version- the FTC saw the first version was already in the best seller status- so they really got on his back even more.
If a book only sells so many copies-- they dont particularly care , but if it goes over a certain amount of sales to the public-- there is a more strict criteria on what is permitted on future copies because then too much info than they feel is necessary will be going out to a wider audience..