Honestly, an actual marketing team would be much better than bounty campaigns. The ICO would most probably be successful with a marketing team, given that the project is good. The only reason why companies use bounty campaigns is because it would cost almost nothing, if not, actually nothing. Whereas a marketing team would be too.expensive for a small/starting company.
But i think that bounty campaigns like signature campaign, twitter, facebook redit and so many other campaigns my be so much successful, and that is the reason that almost every ICO owner want introduce their ICO through bounty campaigns, i think social media is playing a very much important part because in this modern time most of the people are are connected with social media.