Winner takes all could be very viable in any fight, if the fighters themselves make a side bet against each others purses and sign their own legal document with two witnesses.

Do that out in front of the cameras and everyone is into it there would be no backing out either.

I cant make out fighters who mouth off to everyone about this and that and how they want extra cause they reckon they are the better fighter and the better draw card; yet they wont back their own words and put their own purse up to the fighter they are bagging on.