Upsets are more than necessary in pro wrestling. For a promotion to truly create an emotional connection with its fanbase, while cultivating an unforgettable environment for its product, upsets must exist.
Upsets have been used in various capacities in pro wrestling. They have been used to emphasize the dastardly nature of a heel, and also as a vehicle to make a young up-and-comer a star. Most unfortunately, upsets have been used to publicly embarrass talent that the powers that be feel need to pay dues.
Whatever the case, when done correctly, upset victories have lead to some of the biggest and most memorable pops that pro wrestling has to offer. True upset nirvana is reached when said moment lays the foundation to an even more memorable career.