I wont be recommend to outsource your bounty campaign to an agencies as we all know the success of any project depends on the community, Most of the agencies out there are professional no doubt but they miss the charm that one have for the project.Moreover along the journey from pre ico to ico and after if you are doing an In-house you would have a greater understanding of what people think about your project you would came across real smart people who can increase value to your idea.Still either way the team really needs to have an deeper oversight and engagement than the bounty managers.