Is your main idea to support the project or just to make profit from the bonuses and go your way?
No one, investors and traders alike, is a Saint in this aspect. We are all here for the profit and gain from what ICO we venture into. And also in my experience, I have learn not to fall in love too much with any project. It's cool to support projects and at the same time be ready to dump at the sight of dip.
Frankly speaking investments are always about money and getting reward for risks you have. So I participate in crowdfunding mostly (95%) because of reward. This is my main incentive just like for every professional investor around.