Reward is very important but it should not be put first, the first thing that a manager should consider is if the project is legitimate or not, because it's useless to be attracted to a big reward when in the end all our effort will only be wasted as the project goes "SCAM".
It is not the job of manager only but also for the participants to judge the project. If a person is willing to advertise the project they should be careful not the promote a scam project as well. But very few of the bounty participants actually care about this, they will jump into it without doing background checks on the team, their website or whitepaper.
I understand, and yes I agree that it's also the job of the bounty hunters but can we ensure that bounty hunters are reading it.
In fact, bounty hunters are just observing which bounty to join, they don't advertise their service like the bounty managers are doing.
If we will have everyone to blame, it will exert countless effort to determine who should be blame, some bounty hunters are just bot, they don't read, what they care is that they just do their job, so it's nice if it will start from the bounty managers since mostly the relationship is only between the bounty manager and the team, as a bounty hunter we can't approach the project team as they will just say they have already appoint something to do the job.