I think the several experiences in working with different projects has made bounty hunters very experienced. They can determine a good project from the start but some of the investors are just new and do not really determine a promising project from a scam and in the end scammers run away with their money. So bounty hunters who invest in ICOs will never invest if they do not trust the project.
You absolutely right, most bounty hunters understand before ICO that the project is waiting for failure and do not participate in its promotion. I think that bounty hunters have the biggest experience and they are the best at understanding the quality of the project.