If you can not take the right decision then get some idea from pro users and know which bounty they are using then you can find good bounty without any hard work.For me, I always try to scrutinize of the budget allocation regarding the bounty campaign, also recruited bounty manager would play an important role for this issue not only that but also checking the team is a vital point.
I, too, used to choose bounty for popular managers, but now I made a conclusion for myself that the less the manager has, the better. This means that he responsibly approaches the selection of campaigns and not enough of all the projects that will hire him.