Right now, for each new player that connects, the server uses %3-5 more cpu. When I connect by myself and hop around, I see it going from 2% to 14%. So when the server's full, its using 50%+ of the cpu. If this was just occuring on LM, NS server rentals wouldn't be 30% more expensive then CS ones. (nuclearfallout.net 10slot, CS: 28, NS: 42)
If a large hosting company cannot regulate the cpu ns uses, I don't really think we have a chance at doing it for each server.
This isn't even counting the random times when the cpu usage spikes to 100% and stays there, requiring HLDS to restarted.
I'm not sure how much I would trust the values past 11 players, because I haven't had the chance to get more data on them.