L. Ron Hubbard...Genius or Washed up science fiction writer?

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I'm thinking he is a rich man selling fiction books he has written and taking advantage of people who aren't really all there mentally. Like Tom Cruise, he was kinda normal then he joins Scientology and he becomes strange. From my understanding you have to keep buying this guys books to move up in the church and learn, can poor people be scientologists? Is this guy a has been science fiction writer making money on books and having people worship him or is he just nuts?