That will really benefit all parties, it could even encourage bounty hunter to purchase some tokens during and after the campaigns.
It is only useful for bounty hunters. The ICO will lose money if FIAT payments are made to bounty hunters.
You say the bounty hunters will use that money to buy the tokens? I think no one will buy it. The bounty hunter needs money. And if they have money they will leave the project, That's for sure
It's not a good, idea to earn fiat as we participate in bounties because there's no fluctuation in market and we can't expect higher profits ,If bounty project distribute high rewards then it is good to earn fiat but if the rewards not much higher then it is necessary that people will not able to participate.