I agree that if the bounty hunter paid with ethereum and bitcoin, but it all depends on the developer. In addition to not wanting to spend money, Developers do not want their coins to be quiet trading. Maybe there are some developers who want to pay with ethereum or bitcoin but only a little.
This certainly hopes any bounty hunter because it will be easy to sell the coins by the results of their work. but it will require a huge expense and certainly not recklessly brave projects issued capital of it it. Moreover, with the payment of coins from the ICO also helps these coins to be marketed so that it can be easily recognized by the investor is not merely a payment only.