Scientology. Set up by the science fiction writer L.Ron Hubbard purely as a way to get rich. He had serious money difficulties as well as probably PTSD from military service. He discussed ways of getting rich with other famous SF writers and setting up a religion or cult was the way
Started off as Dienetics – a mix of cod psychology and basic self help then morphed into a full blown cult. But its only rationale was to get Hubbard rich
“You don’t get rich writing science fiction. If you want to get rich, you start a religion.
Response to a question from the audience during a meeting of the Eastern Science Fiction Association on (7 November 1948), as quoted in a 1994 affidavit by Sam Moskowitz.
This statement is similar or identical to several statements Hubbard is reported to have made to various individuals or groups in the 1940s.”
https://en.wikiquote.org/wiki/L._Ron_Hubbard