I wasn’t talking just about reselling, I was talking about preventing the commercial use of technical curricula labelled as NC.

For some people it’s less about the money and more about the desire to keep information and knowledge free. NC prevents commercialization of the product at hand. For something to be Gratis does not make it Libre, but for something to be truly Libre it must also be Gratis. Your equivalence implies a two way road where only a one-way street exists.