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.
Having many projects in campaign doesn't mean you are more experience than investors. Serious investors focus on research and investigation before they put their money in an ICO while bounty hunters focus more on bounty reward and allocation.