Don't Limit Copies
I totally disagree with your position to "limit copies."
I used to work in a government bureaucracy and it always amazed me that people didn't share information. I wasted countless hours working on something that had I known what others in my web of workers had known I could have saved the trouble and time or done a better job. Whenever I sent out an informational email, I tried to think of all the people who might find that info useful and cc:ed them. It amazed me that others didn't do the same, but then it was a govt bureaucracy.