I'm not 100% sure about this, but I know a lot of the mountains up north use one to start bump runs...Insted of just blowing a lot of snow, and getting bumps, the drive there groomer over them a certain way, making bigger bumps
Not sure about this either, but maybe there spring time grooming won't suck as much if they groom uphill insted of down (not sure why, but we can hope)