Great idea!
I've thought of a way it could be made to work in the context of a competitive tournament, without any extra cost to the producer. Here's how it would go.
At each stage of the competition (except the final), the fees for each match are paid on the basis of winner take all, as they were in old style prize fights. The winners of the first series of matches walk away with double the fee they would normally get for a single fight with that producer, the losers get nothing but the opportunity to progress in the tournament and earn their money against a series of progressively weaker opponents. How many times they have to fight before earning their pay depends upon how well they perform.
At each stage, or round, of the competition the prize money at stake decreases slightly (10% maybe). The money the producer saves on match fees by these progressive reductions goes into the pot for the final, for which both girls, of course, would have to paid.
For the loser of the final to have to go home with no pay at all, as well as the shame of enduring several successively more humiliating defeats, would be not only grossly unfair but would probably lead to some of the weaker girls pulling out early, once the prospect of it happing to them became apparent.
What do think, feasible or not?