He was obviously quite competent in many respects. He created Dn as a self help methodology, originally, and people (regardless of whether one believes in its efficacy or not) really liked it. That's competence.
He then created the cult. He had no trouble doing that. He had no trouble amassing many millions- if not billions of dollars. That's competence.
And all that's without considering any possible efficacy to "the tech" which I'm also able to do.