I'm going to stick my neck out here as someone who regularly makes NC and ND contribution to the community. It's unhelpful and unpleasant having people class your work as second class because of some other peoples' arbitrary redefinition of the word open. There are a lot of greedy and selfish people out there and my efforts to put my works in the public domain are for then general good and not to fuel such people who offer nothing to society in return.

It doesn't mean that my efforts can never be moved forward or turned to profit but it does allow me to vet the intentions of those that I let do so.