Bounty campaign is a good way for projects to spread the word and gain publicity in the cryptocurrency market. But it is not the best way to gain investors. Good projects don't depend on bounties alone to promote their token sale.
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.
Your words are true to certain extents.
Bounty campaigns thus help to spread information about projects on this forum (most importantly) and likewise social media campaigns
If no projects get investors from this forum, social media or even in YouTube, then perhaps their product is not one that needs investors
And we cannot deny that bounty campaigns is a huge part of the project as a whole, because most of the projects are crypto-based, therefore, their target group of people are those inclined with this industry. And the team's marketing strategy is no longer surprising through bounty projects it is like rooting for the core people needed for a subject matter.
The goal, I think, of bounty projects is to promote the existence of a project itself. Participants of a project may not directly promoting the project but it still spreads awareness. It is indeed true that the long term run of a project depends on the team's effort regarding with their plan, not including means of promotion thru bounty campaigns, but it is also true that bounty projects are part of that 'effort'.