Being a former Scientologist as a young adult, I do know that you can succeed in life if you apply the knowledge of some of their things. Much like a self improvement book, you take what you can from it and apply it to your life. The scary part is the whole drop everyone you care about from your life if they don't agree with you thing. That is what drove me to leave and protect my family from the whole thing. Not talking to my own mother for a year because she fled the city to avoid dealing with them was no fun. We also lost our home and everything we had because she gave all her money to them. There's a point where it is dangerous. I do believe alot of the stars may be able to apply things to their careers and be great at it but when you become someone like Tom Cruise who publicly bashes anyone who doesn't believe everything he does, it is no longer something that is helpful.