well, you see (i just did it, didn't i?
got lured here just coz there's INTj in the thread name), INTjs simply LOVE self-reflection. we reflect on a lot of things, but most of all we reflect upon ourselves. not exactly narcissistic, because that implies self-examination with approval. and you can never bombard a theory with enough testing, so an INTj's idea of the self can never be tested against other INTjs enough - it affirms or discredits portions of the self-idea and weeds out what's basic personality and what's personal development and nurture influences. it's just irresistable.