Seems reasonable to allow a resort to restrict what kinds of equipment are allowed to be used on the slopes.
I am a little surprised that there are not more resorts that ban snowboarding - or even ban skiing. My uneducated guess is that it is more expensive to have a ski school capable of handling both types of students.
What would you think of a resort that was snowboarding only? What would that resort look like? Would the chairlifts be designed differently? Would anyone show up?