great rewards if you can do great work. For example, you can work to complete all campaigns in the bounty and can complete all weekly tasks. You'll get paid more than just following one campaign. for now it is very rare to find bounty scams, and many of the managers who manage bounty campaigns are paid consistently. I think do more work and you will get the maximum pay.
On top of that you need to find a legit bounty first, I mean a project that is worth for your time and effort even you do a multiple task in order to get a high rewards.
The problem now is its hard to find a good bounty because majority of them are just scam.
That why its more reliable to join in a campaign that pays in Bitcoin, because if your rewards are tokens, you're not certain if it will have a value once you decided to sell it.
It's very hard to find a good project to join, most of the projects these days are worthless or then they won't pay the bounty hunters.
A good way to avoid this is that bounty hunters can choose projects from reputable bounty managers like: Detective Bounty mentioned above, yahoo... to limit the risk minimum.
The reward is more or less depending on how you choose the project and your efforts.