Back in the day, ski patrol would turn on the lifts at Vail on full-moon lights and tear it up. Everyone in the morning would wonder how it got torn up so fast. Due to insurance and lift op reasons that will never happen again. I think the high end touristas want that powder too and they are paying top dollar for it. I think Vail only has about 5400 acres of skiable terrain.
At WP, the morning after a significant powder dump, morning clinics are banned from all the main tourist runs. Every Sat morning we can't even go down certain groomed runs. These are to be saved for the bill paying public.
The hours you are talking about are the hours the full-timers use for their second job or for some serious partying.
People do ride down Loveland Pass on moonlight nights.