Fan loyalty is the loyalty expressed by a fan towards the object of a fans fanaticism. Fan loyalty particularly with respect to team sports is different from brand loyalty. Fan loyalties continues even if the team that the fan supports continues to perform poorly year after. Fan loyalty and engagement is so important to sports organizations because fans want to be involved throughout the year. Fans will purchase merchandise, season tickets and attend events hosted by their favorite teams. For example the Chicago Bears were not so great last season but fans still attended events such as football 101 ladies night , the Chicago Bears bowling charity event. I think it is the fans engagement that helps increase the revenue for the team as well as the leagues. In this case the revenue can increase by fans being involved and attending games and events. The revenue can decrease by fans not being active and attending games and events. The organization and teams are currently using social media sites to increase fan loyalty. The teams and organizations have trivia questions they post on sites such as twitter which leads to fans responding in order to win a pair of tickets or autographed items. Using the team social media site helps draw a lot of attention with capturing pictures of the experiences. Freebies are another way, free raffles that allows fans a chance to win tickets and meet and greets.
http://opendorse.com/blog/how-stadiums-are-changing-the-fan-experience/
http://blog.hootsuite.com/social-media-fan-loyalty-2/