I wish projects could effect the standard of paying bounty hunters with ethereum or btc. This would be more beneficial both to the bounty hunters and the project. The project team always term the bounty hunters dumpers and the bounty hunters are in most cases concerned with immediate gratification and that explains why they want to sell out the tokens for eth or btc.
This will be very beneficial for the bounty hunters on that you are right but it will not be beneficial at all for the developers of a project, if they pay with bitcoin or with ethereum then they need a decent starting capital and if they do not have it then their bounty campaign will need to be shorter and smaller in size compared to the projects that are paying with their own tokens, and finally the biggest disadvantage for them are the costs, a long marketing campaign will be costly if they paid with BTC or ETH but it is free if they pay with tokens they just created.