Sad part of this bounty activities you work for the team and wait till they give your rewards but then after the value isn't worth for the time that you work, and some of them ending up to be nothing or just a scamming project that resulted to nothing at all.
At present we cannot expect too much from the bounty that are running, because many bounty have been completed but not paying participants at all, and of course this is very detrimental to the bounty participants
Don't you know one of the difference between IEO and ICO? if you are campaigning for a project hosting an ieo then certainly that tokens already have an exchange to trade, which also means bounty hunters will have the chance to dump their tokens as well, project are not able to raise funds which is why bounty are suffering now.