What is ironic about the description of the friar in the cantuburry tales

 Considering that Friar's had pledged a life of piety and poverty, the description of this Friar is a scheming man who indulges in all manner of sins. This Friar seduces women, "maad many a mariage / of yonge wommen at his owene cost." He also solicits donations and lives a rather lavish life full of good food and comforts. He sells the Church's forgiveness: if the price is right! !