Former US President, George W. Bush frequently used the term "the coalition of willing" during his campaign to rally international supports for his war on Iraq. Although I do not share his view on the war on terror, I do find the term to be very applicable in building collaborative advantage among like minded people.
To start a collaborative project, we need to ensure that the people are truly willing to work with us. Willingness to participate throughout the process is the key to successful projects. If they do not, we must accept that people have the right to not agree with us, and they can have their own interests instead of going along with us. Hence, if the willingness is not there, we should not continue with the collaboration.
If we believe in building long-term collaboration, we will not resent anyone who have decided not be collaborate with us for whatever reason. Those who are not with us are not necessarily against us. If you look at a statistical normal distribution, you could see that majority of the population is situated around the middle of the curve. Most people are indecisive (including us). People are more comfortable to be fence sitters. They tend to be observers until favourable trends are indicated before taking any action. Nevertheless, we still want to build good relationships knowing that they will be willing to work with us when the time is right.
However, I do not suggest that we collaborate with everyone indiscriminately. Being collaborative does not make us immune from being deceived or being taken advantage. In fact, this is one of my big worry when I suggested the idea of collaborative advantage. The relationships must be win-win, or no deal. If you think people are taking advantage of you, or they just want to let you do all the works while they reap the results, then it is a win-lose situation. You should not continue with the collaboration. Likewise, you should not try to take advantage of your partners as well, or else the genuine collaboration will not occur, and you are creating a withdrawal from the emotional bank accounts with your partners.
Do not try to please anyone by sacrificing your own interest; likewise, do not scarify others for your own interest. "It's win-win or no deal" (another quote from Dr Stephen Covey). This should be the way to build the coalition of willing to achieve our collaborative advantage.