#4 The UFC hasn't been able to create that 'next big star' as of yet
When you speak about top young stars, names such as Darren Till, Brian Ortega, Valentina Shevchenko, Sage Northcutt and Paige VanZant come to mind. While certain fighters such as Till, Ortega and Shevchenko have proven their mettle by winning and solidifying themselves amongst the elite; stars such as Northcutt and VanZant haven't found the degree of success the UFC expected from them.
Ironically enough, the UFC had put a tremendous amount of marketing power behind the aforementioned Northcutt and VanZant; only for the former to have a ho-hum run before being released from the company, and the latter to be stuck in a rut after multiple losses.
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Honestly speaking, despite the UFC roster boasting the likes of established stars such as Conor McGregor and Jon Jones, the company has failed to create the 'next big star' as of now. Considering that, it isn't really surprising that a Brock Lesnar PPV which will surely rake in a considerable amount of revenue for the UFC, would be a welcome contribution to the promotion's annual earnings...