Intuition and the Curse of Knowledge

The Marketing Experiments blog wanted to know if you could choose which email design worked best in a Pier 1 email campaign. I always enjoy participating in these exercises because they are usually a challenge. In this particular case study, I was the only one who chose correctly in the comments.

Today's excercise has inspired me to re-read Malcolm Gladwell's book Blink: The Power of Thinking Without Thinking. I am wondering if there is a threshold for when intuition is lost and the curse of knowledge takes over. If so, how do you discover that threshold?