Ico project is a type of project where in a large number of people participating the project is the main indicator for it to be succesful, so I can confidently say that the main key for a project to be succesful is to establish a strong campaign mechanism to encourage people to join the project. In that sense the bitcointalk is doing it, It is a must that a project is headed by strong willed managers doing all the planning and application of campaign. lastly the project should be worth rewarding for the participants because despite of all benefits the managers shout take good care of the campaign members for they are the vessel of wealth why the project becomes succesful.