One of Derren Brown's mentalism specials made use of bringing more than enough people into your scam that there will be an impressively large number of successe

One of Derren Brown's mentalism specials made use of bringing more than enough people into your scam that there will be an impressively large number of successes. Of course the biggest success stories are the only ones you will hear about, even though they are less than 1% of the people that fall for the scam at hand. You only need a small handful of success stories to make something unlikely sound like a no-brainer.