I think one thing that makes a project to be successful depends on the members supporting the project. Also, i think the project should be fully advertised so many chances that people will be aware of it and get interested to participate in the said project.
Yes, in some cases making a project successful depend on the people supporting the project but the main thing which determine the success of a project is the uniqueness of the so called project, outstanding marketing skills put together with the owner need to be honest, be intact in terms of communication and always be no time waster because time waster are life waster.