I just do not understand why people would want to work for free without any guarantees at all. If you are really unlucky you could spend 1000s of hours doing work for these bounties and profit nothing. I am interested in hearing about your experience with these bounties and how much you profit when it comes to withdrawing the tokens.
If someone told you their earnings, and then what? You don't need to question why others are still participating in bounties today. You are violating a bit of their privacy by asking some figures.
No need to give you some pointers or convinced you if doing and joining bounties are worth it or not. Why should someone take the research for you rather than testing the waters based on your own considerations. Let your experience or how you looked at the current situation tells you the answer.
Simply there's no need for a much deeper explanation to this. Others are still making good payments while others are not.