One thing that scares me about the CMC - and makes me ensure at present I would not want them:
Aurora is a finite resource game.
Witht the situation of you either pay for the CMC minerals, or permanently loose them, I know I would be sending the troops in every time a CMC was set up and expropriate it to governmental control. The potential loss of resources (or forced purchase at a time you may not be able to afford them) to me is not worth any potential benefit...
If they did not eliminate resources, then it would be okay.
Perhaps this can be alleviated by including a geo team in the CMC that over time will keep it from permanently destroying minerals...