Bonus dont need to be fair, because they are gifts given at management descretion that do not involve any set criterion, except a certain type of finish, possibly.
I dont see anything wrong with that. Now if they awarded KO of the night to someone who didnt produce a KO just coz they like that fighter more, thats a bit off...but they havent done that to the best of my knowledge
Gifts are given from the giver to whomever they desire...and frankly...if your pissed at someone then you aint gonna give them a bonus are you, you wouldnt pay them extra if you didnt have to.
Stats are interesting though