The question with the sub-key! When will the developers receive their reward? For me, the answer is the most important decision.
Do you mean developers who work at the project? They will receive it only at the end, when project starts to bring revenue. So they are taking the risk of not getting to that point - but they are charging project owner more than they normally get to compensate that risk. I.e. if normally some task is 100 USD for some developer to do, because he is taking payment in project coins and ready to accept risk, he may be charging 1000 project coins (which are lets say mapped to 1000 USD of future revenue). So if project will really bring revenue - developer will get 10x more than he normally get.