As a writer I don't mind people reading my stuff - heck I love to get constructive feedback, I do at the same time not particularly like to try to get involved with big media "lawyery" antics for now and NC & ND releases and asking people to contribute what they feel is the right price, is a better and more acceptible way for me to head down for now.
I would as a content creator however feel rather cheated to see my characters exploited without seeing a single dime if it became wildly popular, so the option is to release as CC under ND and NC to insure that people don't just run off with an idea without prior agreement by me and secondly to ensure people do not try to profit on what I want to make available for free at least not without a consultation with me.
I can understand it might be a nuisance to have to get in touch with me to be allowed to use my ideas or characters, but hey those are the terms.
I as a writer just want to make sure that my audience gets my stuff with minimum hassle - that does not mean I am willing to sign away every right I have to my stuff or any opportunity to make a profit off it just because someone doesn't like to pay for it, while they themselves wish to do exactly that, i.e. make a profit.
Thus the NC as in - If you want to use it comercially - get in touch with me.
And the ND - If you wnat to introduce something into my "universe" we need to talk.
There is nothing in the CC preventing me the owner from releasing to someone else under different terms - we just need to talk first.
Throwing away the ND and NC from the CC license would make me go for a different licence as I wish to in some respect have an influence on what I create.
Heck if someone threw a big bag of money at me I might just say feel free use as you please - but till that day - Forgive me but I'll stick to NC and ND.