Most skiers without instruction simply get better and better at bad skiing.
But who's to say? How would you know until you make the breakthrough? How do know that there's another dimension until you get there and look back? If you don't know that there is more to it than just what kind of terrain and conditions you can "get down," why would you think a lesson would benefit you? As the artist Degas said, "painting is easy, if you don't know how to do it."
Sorry for dredging up an old thread, but Bob, your post reminds me of Plato's Cave:
Plato lets Socrates describe a group of people who have lived chained to the wall of a cave all of their lives, facing a blank wall. The people watch shadows projected on the wall by things passing in front of a fire behind them, and begin to ascribe forms to these shadows. According to Plato's Socrates, the shadows are as close as the prisoners get to viewing reality. He then explains how the philosopher is like a prisoner who is freed from the cave and comes to understand that the shadows on the wall do not make up reality at all, as he can perceive the true form of reality rather than the mere shadows seen by the prisoners. (From Wikipedia summary)
As a group of "good skiers" (assuming many of the people here fall into that group), we are akin to the philosophers returning to the prisoners, trying to describe an entire new reality. It's simply unfathomable for the uninitiated except through vague allusion and narrative that captures only a hint of the experience of good skiing.