And this is because when bounty hunters post about a project, majority of these posts is only seen by other bounty hunters and not to the real investors. And these posts are just basic and can not convince good investors to invest.
Bringing in the investors and funds depends on the team's marketing ability and their ability to close deals. This is why good projects attend a lot of crypto events and network with people.
Though bounties help a project to create popularity and hype among crypto users, the main investment and funds is brought in by the team's marketing and closing ability.
For your information, many projects during the year 2017 had bounty campaigns in this forum. They are all hyped because of bounty hunters who are spreading the projects throughout the world. Bounty campaigns are helpful for the projects. That is why you should not underestimate the power of bounty marketing. We can say that the bounty becomes useless when the project itself is trying to scam the people. Either tha bounty hunters, managers, or investors.