Most of bounty campaigns pay in the same coins participating with and promoting at the end you can use that amount for bitcoin or eth as you wish . in case the marketing campaign was good behind well constructive project then everyone is winner .
I think it always depends on the team behind the ICO if they will pay with btc or eth or they have their own tokens that will soon to be listed in the exchange platform.But having paid with btc or eth at the moment is like giving us a bonus because the price is still high compared to some other coins.