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.
That's true the development team should see to it that they have a product worth supporting, not just a pump and dump project with no real usage in the community, projects come and go now, investors now want a project that will evolve like Tron Binance and Eos among others, easy for this kind of project to get funded and supported if they see a project that will evolve for a long time.