In the pardoner's tale, how does the pardoner use his history to accumulate wealth for himself? what does this mean about him?

In his prologue, the Pardoner frankly confesses that he is a fraud motivated by greed and avarice and that he is guilty of all seven sins. Even though he is essentially a hypocrite in his profession, he is at least being honest as he makes his confession. But then, ironically, at the end of his tale, he requests that the pilgrims make a contribution.
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