Honestly I haven't joined any bounty campaign in this forum but by reading reply, it seems that it is no difference from bounty campaign on other forum such as Bitcointalk. I have been in that forum for more than six years and witnessed a lot of scam bounty campaign. Though I see that this forum somehow gives a better restriction on bounty campaign here, there is no way to tell whether that bounty campaign will end up as scam or won't pay the participant. We should never expect to much but rather expect the worse in joining bounty campaign. Doing research also help in avoiding scam bounties thus it will save us from wasting our time.
The campaign here offer more reward on higher rank so better make use of the time to rank up first, familiarize yourself in knowing this forum and how bounty works here than rushing yourself to a bounty campaign and end up being disappointed.