Why does the pardoner choose to reveal his trade secrets to the pilgrims?

The Pardoner reveals his trade secrets to the pilgrims to expose the hypocrisy of his own practices and to emphasize the theme of greed and corruption. By admitting that he profits from the gullibility of others, he seeks to entertain and provoke thought among the audience, showcasing his cunning and manipulation. This self-awareness also serves to highlight the moral complexities of his character, making him both a figure of disdain and a source of dark humor in "The Canterbury Tales." Ultimately, his revelations reflect the broader commentary on the nature of sin and the human condition.