I think don't expect too much to get rich by following a bounty because it's difficult to find a good project, bounty is only to increase income.
And I doubt too that bounty campaign can be used as an increase income tool. You may know how many project that end up with scams? I guess it's a lot. Then will you be paid if you taken part with such bounty campaign? I guess not, even you won't get anything from it you have acquiesce if you find with this situation. Find signature campaign who paid you with bitcoin and I'm sure you will get profit consistent if the signature run for a long time.