I suggest every new projects team should do this if they want to introduce bounty campaigns for their project, doing this will limit the risk for tokens losing huge value because bounty hunters sell their shares.
1. Find good bounty manager
2. Give up only few decent allocation
3. Go for strong exchanges with no fake volume
4. Accept limited participants in your bounty campaigns
5. Introduce phase distributions
Yes I totally agree with you. Many bounty managers are indifferent to work. Many are inexperienced. Such an irresponsible bounty manager kills the project. So a good manager is needed to make the project a success. Moreover, it is important to have a good exchanger, right price, real candidate. So, your idea is absolutely correct.