Promoting is crucial. Bounty is still a good way of promoting your ICO. But you need to invest on a known manager to manage the campaign. Which this will result more people to join it and have a wider spread across the web. And also getting the project's name out there will attract investors. But always keep in mind that it's extremely difficult on reaching the max cap if you don't have good partners. So it all depends on the quality of ICO that people are interested on.