While true exhibition matches are not uncommon, most matches tell a story analogous to a scene in a play or film, or an episode of a serial drama: The face will sometimes win (triumph) or sometimes lose (tragedy). Longer story arcs can result from multiple matches over the course of time. Since most promotions have a championship title, competition for the championship is a common impetus for stories. Also, anything from a character's own hair to their job with the promotion can be wagered in a match. The same type of good vs. evil storylines were also once popular in roller derby.
What can be wagered in a match? 
from a character's own hair to their job with the promotion