Trying to be logical for a few moments, not that logic matters when it comes to Hollywood or Washington:
There is no ‘upside’ for either of them.
If Bieber’s loses he gets laughed at for getting his ass kicked by a 50+ year old man.
If Bieber wins he gets fucked with for beating up a 50+ year old man.
If Cruise loses, his ‘tough guy’ movie image is damaged. Most people expect he would mop the floor with Bieber.
If Cruise wins, well maybe there is an upside!
Even though it would be gay as fuck, I have to admit I’d buy the pay-per-view, understanding in advance there is no chance I’d be satisfied at the outcome. Period.