Up to now I have not yet earned really well on doing bounties, some of them are scam and some of them are not successful and no exchanges to get listed. It is the risk of doing this kind of things because we only invest our time and not money for this.
You didn't realized if time is more important than your earnings. No matter how much your money, you can't buy time and you just wasted it for promoted something which don't deserve for your hardwork.
Not only the person above, most of the people are promoting the campaign which they are getting deserve amount what they are working. We should always try to research more about the project otherwise we will not make even penny for the work we do.