If you can't trust yourself to follow these instructions, don't go. Which is probably the right choice for most people. But if you can, I can imagine some positive consequences of going.

First, you can watch and learn their manipulation techniques. Then you can use a weaker form of them for your own benefit. Second, this kind of seminar does fill you with incredible energy. Just instead of spending the energy on what they want you to, prepare your own project in advance and then use the energy you get at the seminar for your own project.