I think the most predatory sales pitch I ever went to was cleverly marketed as a "Day of Power" or something like that. I had gotten free tickets to a "convention" at the Toyota Center which featured speakers such as Colin Powell, Rudy Guiliani, Sarah Palin, Mike Ditka, and a few other presentations I'd never heard of. The first couple of speakers were good, and it was all very red blooded, rah-rah America, stuff. The lady who put the conference on (with her husband) gave a moving testimony about how she was a crack addict, and on the street, but through her faith in God and the American dream was now a millionaire.
THEN the sales pitches started. $12,000 for trading software which heavily intimated 80% monthly gains and 7 figure annual income. They kept interspersing random bits of Christian or Patriotic sound bites; which were so blatantly obvious but the crowd ate it up. There were people weeping as one of the presenters gave away his pamphlet on how to make millions flipping houses to a disabled vet, and a single mother. They all used the line "Could I have kept this information to myself and made a billion dollars? Yes, but my master isn't of this world, and I am my brother's keeper; so for only $4,999 you can buy this dvd series on how selling blown glass trinkets in your spare time will make you a millionaire".
The saddest part were the very genuine, very gullible low-education masses with their "United We Stand" Shirts giving away all of their savings to the guys on the stage. I was really surprised that Colin Powell, Palin, and others had gotten roped into it.
EDIT: Found an article about it, the "Get Motivated" Seminar series
http://usatoday30.usatoday.com/money/media/2010-09-28-getmotivated28_ST_N.htm