Why might peasants be interested in fighting in the crusades?

One reason why peasants might have been interested in fighting in The Crusades is because this would have enriched the crusading country--which would have led to an increase in their standard of living (to a certain extent). 

The second , larger puritan colony of massachusetts bay was conceived as a "city upon a hill". but it also struggled with internal turmoil like the salem witch trials and external conflicts like king philip's (metacom's) war.