The scientific skeptic in me says it's because Tarot cards actually have a wide meaning of interpretations, and can be vague enough that you can make pretty much any interpretation you wish, and you can generally get by on telling people what they want to hear. Knowing how to do that is more about reading people than it is about cards, or tea leaves, or runes.
The charlatan and RPer in me says BECAUSE WE BELIEVE IN THE HEART OF THE CARDS! THEY CAN GUIDE IS TO THE TRUTH!
The charlatan and RPer in me says BECAUSE WE BELIEVE IN THE HEART OF THE CARDS! THEY CAN GUIDE IS TO THE TRUTH!
No Gods and Precious Few Heroes