Oh, I don't know that it's fair to say they're stupid. It's like any system of faith, Catholicism for example. Not everyone can be Thomas Aquinas. As for interests, Randism is flexible; when you want to do something that doesn't make you money immediately, you say you're doing it 'in the name of the best within us' or 'true selfishness' or something.
The funny ones are the ZON POWER objectivists who claim to have proven 'objectively' that ZON POWER objectivism will bring you immortality. It drives the garden variety objectivists up a wall.
LP