You can do a CC without the NC as 12Rounds has said. All I am going to say here tho is that the CC license is not limited to the guild. If it has CC BY-SA then another web site could take the whole thing lock stock and sell it. Thats within their rights. You may find some people reluctant to work on a non NC but then maybe people don't care. I have often found that people don't care about the licensing of their work most of the time until someone else is making money off of it then suddenly they do.

Maybe have a vote on this one. If it is CC then would you not work on it unless it had an NC clause or would you only work on it if it didn't have one or you don't care what happens to your maps in it.