Here's why:
* His vanity: The king's son is obsessed with his appearance and the admiration of others. He constantly worries about his clothes, his hair, and his posture. He believes his beauty and charm are his greatest assets.
* His blindness: His vanity blinds him to the true nature of his father's wishes. The king actually wants his son to learn about life, to experience the world, and to become a wise and compassionate leader.
* His consequences: The king's son chooses to stay in the palace, focused on his superficial life, neglecting his father's desire for him to explore and grow. He chooses vanity over his true potential and the opportunity to learn and develop his character.
In contrast, the protagonist Santiago, while initially drawn to material wealth, chooses to follow his Personal Legend and embrace the challenges and experiences of life. He chooses growth and wisdom over vanity and ultimately finds his true treasure.