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.
Perhaps you are right. But do not think that all the bounty hunters are so experienced. Many of them just take part in all the projects, hoping to get as much money as possible. And in the end they get absolutely not the amount they wanted, because many of those projects simply did not pay them for their work