In the first case, the speech becomes an action in the same way that politely requesting that a bank teller give you all the money in the bank or you'll set off

In the first case, the speech becomes an action in the same way that politely requesting that a bank teller give you all the money in the bank or you'll set off a bomb is an action. In the second case, you're defrauding people and endangering their lives, but it's not the speech that's regulated; it's the selling. There's no law that says I can't publish an article saying that eating a pound of carrots a day will cure cancer. Of course, I do think professional bloggers should hold themselves to standards of journalistic ethics, possibly even forming an organization that gives out certifications.