I feel I must point out something...
One of the major themes of "The Fortune Teller" was that Aunt Woo was wrong. The man who would have a safe journey was attacked by a platypus bear. She lied to Aang about what she saw in the bones. She was wrong about the volcano. That one man can change the interpretation of that last one all he wants, but there's no denying that her initial prediction involved the volcano not exploding.
I'm certainly not as close-minded as Sokka to the supernatural, but when it comes to fortune-telling; both in real-life and on this show - I consider it all worthless.