I dont know if I agree with the cost element. I would bet the catering company has the info already. Again, it doesnt really bother me that the info is not provided but dont think it should really cost that much more to provide it.
I have pretty good nutritional awareness but every now and again there is a side or sauce that surprises me on calorie/fat/cholesterol content. That is why I like to have the info. It is one flight unless you fly a lot then it can be a regular meal you are eating.