#1. The Royal Rumble winner will headline WrestleMania
Perhaps one of the biggest lies that WWE has ever told since the Royal Rumble winner hasn't been given the opportunity to main event WrestleMania for a number of years. The reward for winning the annual match in the current era is for the winner to go on to face a champion of their choice at WrestleMania instead.
Drew McIntyre was the last WWE star to win the Royal Rumble match and went on to headline WrestleMania. This means that the likes of Randy Orton, Shinsuke Nakamura, Asuka and even 2019's winner Seth Rollins were not given the opportunity to main event the show, even though Rollins' Universal Championship match against Brock Lesnar was expected to main event but instead WWE allowed the female Royal Rumble winner Becky Lynch to headline the show for the first time.
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The WWE looks at the ideal combination of star power and storyline heading into Wrestlemania. If some feuds do not generate the necessary momentum, they drop it from the main event in order cater to the WWE universe. They also have agenda-driven decisions that focus on pushing certain superstars and storylines ahead.