If I can't find a bounty project that's already listed and trading I'm done joining bounties.
No matter how reasonable a project might be if the teams decided to stay anonymous I will pass by
Whitepapers and roadmaps aren't enough anymore,developers should be ready to face the public and be ready to show me they are ready to work ,not experimental on 'it might became success or failure .
That's why I don't get involved in a bounty promised to be paid on tokens. There might be some exceptions when I clearly know about the project otherwise I don't even though they may feel too promising. Whatever small be the reward, you can use it to buy the coin you want and increase your profit by folds until you wait for the project to distribute bounty tokens and the tokens are listed on an exchange.