My approach would be entirely humanitarian though, and I think that is something that is lacking in this aspect of anonymous fiscal operations.
Quick edit: Just to be clear about that part, I would not limit the projects to humanitarian only, that's just what I would do. Any thing is acceptable, whether it be profits and dividends for the investors, or feeding the homeless and developing medical technology. I am also capable of hosting a .onion url from my local machine thus to provide security and anonymity to all users of the site, sharks and fish alike; although it would be difficult to hold those who abuse the system responsible for their actions. But that's the main purpose of this thread. I want people to help me think of ways to protect the anonymous investors above all things. They would be the bread and butter of this project.
The problem with Bitcoin investments (in general, not just in your case) is that you have to offer high interest to make it more attractive for investors than just hoarding bitcoins. But this makes it worse than a bank loan. Thus, if someone asks for money on bitcoin forums or kickstarters, it must be because he/she can't borrow money from a bank or other conventional sources. Now, there are several possible reasons for this, but most of them are negative for possible investors.