SPOILERS whats the point of the con
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Some people on IMDB are bitterly complaining that they don't understand the purpose of the con.
The whole point of the con was to destroy the reputation of Burkett & Randle (Paul Giamatti's company). When Garsik (Giamatti) announced with tremendous fanfare and swagger that baldness has been cured, he convinced a cheering crowd of shareholdes that he has made they all incredibly wealthy. The fact that the baldness cure was bogus (and will probably never exist) means that he will swiftly need to make a very humiliating retraction. He's been check-mated. Shareholders will never trust him again, he will probably lose his job, and the value of the company will nosedive. The moment at the end (during the credits), when Garsik is sitting at his cell phone looking stunned is the moment he knows that his career has been destroyed.
The other option is to cover it up... but that will only delay his destruction temporarily (because time will pass and no product will come out).
I liked the puzzling plot. If you didn't get the first time, then watch it again! Or, just avoid this type of film altogether. YR