Yea, it could very well be it.
But the big disparity between fighter pay and revenue seems a bit fishy.
Here's a comparison between other orgs:
Fighter Pay: Syn' 50: We Are All One ($97500)
Ticket Revenue: Syn' 50: We Are All One ($404,209)
Fighter Pay: CFC 55: Sol vs Mendez ($138400)
Ticket Revenue: CFC 55: Sol vs Mendez ($268,008)
Fighter Pay: Kings of Rio 32 - Hell Fire ($67000)
Ticket Revenue: Kings of Rio 32 - Hell Fire ($295,279)
It would seem that orgs making less money than Pride is paying their fighters more. And Tokyo is a well established city.
Comparison with a fellow org in Tokyo:
Fighter Pay: SFL The Hunted ($46,000)
Ticket Revenue: SFL The Hunted ($138,750)
Fighter Pay: Pride 37: Kinte vs. Austin ($48100)
Ticket Revenue: Pride 37: Kinte vs. Austin ($408,470)