Or you can release all project titles of a month at a time with different deadline. With this we can choose our most favourite topic. And each project can have only the first 10 or more number of interested people based on first come. One can accept only one project. You can automatically turn off the option after each project reaches it's goal.
Dear admins, you can release 6 projects in a month. Then go on with your idea of choosing first 10 who are commenting. For the next 5 projects, these 10 contributors won't be able to join. Maybe only the winner can have a chance to contribute to the next project also. Thus you can divide us up.