According to Osho, the ABC's of psychology are a playful pointer: A—neurotics build air castles (they imagine anxiously); B—psychotics live in those castles (they inhabit delusion); C—psychiatrists collect the rent (they manage the whole show). With humor, he exposes how mind-made fantasies trap us and how roles around pathology perpetuate the game.
It’s a joke saying some people imagine problems, some get lost in them, and others make a living dealing with it.