#2 Crossover appeal
Whether you're a WWE fan, a UFC fan or neither and you just want to see something cringeworthy, this is the match for you. Much like the inclusion of Donald Trump at WrestleMania 23, this kind of contest would appeal to many casual supporters of the product around the world.
Crossover appeal is one thing, but bringing in the UFC would take things to a whole new level.
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You could promote the bout across both platforms, with the media tour alone being enough to send ratings and network subscriptions through the roof. There's a fine line between over-publicising something and getting the marketing just right, which is something that both these companies have a lot of experience in.
You can't get away from the facts - Dana vs. Vince is money. Onto another money-making point.