Skiers need space to arc it, change their line as their whim strikes and snow dictates, have their joy in the mountains. Don't crowd, push, overtake or cut-off other skiers. Period. (acess road/trails with caution and consideration)
I have a theory why it happens around here. Many of the skiers from the nearby metropolitan center are road cyclists. In road cycling, it is the standard to ride very close together for a number of reasons. For racers and avid riders, it is practically second nature. So they ski that way, hike the ridge that way...huddled together as if to beat the wind.
In the mountains, I prefer to experience the elements for myself, and without another skier crowding my space.
Any other theories as to why some skiers just don't get this; it's a huge mountain. spread out.