I once got a book from this Warrior Forum (an online marketing forum) he speaks of, that would supposedly teach you how to earn money online. The main point of this book was that if you want to sell online, you must first find people who are willing to buy online, such as on (you guessed it!) the Warrior Forum itself! Funny enough, on that forum all the praises were positive, suggesting that people are too ashamed to admit they were cheated (or the admins, who took a large cut of all sales on this forum, deleted all posts that could have a negative financial impact). Thank god I downloaded the book!
I know that ad hominem argument is a logical fallacy, but I find it hard to believe the personal opinions of dishonest people.