Crowd participation is an integral part of the spectacle of pro wrestling. Without interest from the fans, any given wrestling segment is immediately diminished.
The WWE uses fan reaction to dictate which superstars will rise up its capricious pecking order, and has often attempted to force fans to invest emotionally in select stars. This is a testament to how important crowd involvement really is to the promotion.
Nothing screams crowd participation like screaming fans, joining in unison to chant in support or disdain for a superstar or entity.
Some of the most entertaining chants ever have been manifested in sports entertainment. Whether fans are chanting for who or what they are supposed to be chanting for, there is nothing more gratifying to a performer than spontaneous, synchronized cheers.