Not only this question is blunt, it's also unethical. Honestly, I've never heard of a single instance of a person cheating on the PMP exam, and passing (to be honest, I've never heard of a single instance of someone cheating, let alone passing).
While I agree that there some unethical candidates who faked their project management experience, cheating, on the other hand, is a completely different thing. First they take away all your papers (they search you), and they have video cameras taping your every movement. Not only that, they verify who you are with official documents, so it's impossible to take the test for someone else, unless, of course, you forge an official document, but at this point you'll be committing a criminal offense and will probably go to jail. Knowing that the PMP is there to make you a better project manager and not a criminal, do you think it's worth it?