So the group lessons are just with the bad instructors and new hires?
Not necessarily. For one thing, I think what Mike is describing is a bit exaggerated by the experience of Aspen - a resort where the number of pros with whole seasons booked through with privates is greater than any other by a long way.
For another, there are some pros who like to work in group lessons, and go there because they want to.
But mostly I think the time of year and the resort matter most.
Your chance of getting a new hire teaching you in a group lesson goes through the roof if you book one Xmas or a holiday week. Even people who are still only in the building phase with clients are going to be booked in the major holiday periods.
They are also a lot higher if you take a lesson at, say, Breck, where the school turns over half its staff every year.