Apparently the original tone of the question offended some people so I have it edited.

My field is highly multidisciplinary and so each of prospective committee members although great experts in their own particular field, may not be greatly familiar with other parts of the project that are outside of their expertise.

1- The project may end up commercially valuable, so I need to protect myself against competition, not necessarily academically but commercially. 
2- A committee since constitutes a great place for discussions of great experts of various field may end up to a point where I could not solely pursue it as the leader and creator of the idea. I want to make it clear that the idea was mine, so it is not hugely disrespectful if I want to be the only person who is in charge of pursuing the idea. 
3- I do want to have great professors on my committee, I want to have the best of the best on my committee. I do not want to compromise the quality of the feedbacks I receive out of being protective of my idea. 
4- I do not want to waste my time on some side project and hide my best ideas out of fear that I may create competition. 

How should I choose, and interact with my committee to achieve the above goals strategically? Should I trust that every university professor is absolutely dedicated to helping, mentoring and guiding students? Is that a reasonable assumption, given that there are policies that force students to give up all their rights to any invention and hand it over to university and faculty? Should a student not feel fearful?