I think if you want to make money from your bounty campaign, then you need to choose a campaign with the manager who has a good reputation because he has been researching about the project before accepting to manage it. You also need to do your own research before promoting your project and know about the pros and cons of the project then you can make sure the project is worth following or not.
you can follow a signature campaign because you can generate a higher profit than by following a social media campaign. However, signature campaigns can not follow 2 projects, it is different from social media that can follow various projects to get more profit. but my advice follows both of them to generate high profits.