Bellator has been paying out roughly an average of 30% of revenue.
The UFC has been paying out ~18% of revenue for the past ten years, a bit lower now. This isn't up for debate its public information from their financial filings and court discovery. 18% includes every single penny attributed to fighters - all bonuses, PPV points, travel, hotels, per diem, insurance, the performance institute.
Bellator makes a lot less revenue so the totals look low, but they are sharing a much more fair split of the incoming cash with the fighters. At some point near double what the UFC revenue share is.
The UFC pays these guys pennies on the dollar.