"It's tough to make predictions, especially about the future."
Yogi Berra
The problem with obtaining information through interpreting tea leaves, divining sheep entrails, throwing darts, astrology and other paranormal means is that they are pseudoscience. It has nothing to do with having open mind. There is simply no basis in fact for employing these techniques because they are not effective.
The excellent magazine "Skeptical Inquirer" (The Committee for Skeptical Inquiry) has many interesting articles about these and other techniques available on-line.