Significance of Fausto's Twenty Dollarsappears in The No-Guitar Blues

In No Guitar Blues, Fausto receives a twenty-dollar bill as a reward for returning a lost dog. Fausto embellishes the story of finding and rescuing the dog. He quickly comes to feel guilty for having received so much money for what was after all simply a common courtesy. Although the money could buy Fausto his longed-for guitar or even a new pair of jeans, he donates the money to the local church.