My highly opinionated $0.02 worth....
I race in an adult race league in an advanced division. Over the years I have been friends with many instructors, some of whom ski in picture perfect form.....down the groomed trails. Got to tell you, I hate that! Not the fact that they are skiing in perfect form, but the fact that they no longer push themselves and are content to mosey on down the perfectly groomed trails in perfect form right up to the chair and then do it all over again. Where is the sense of adventure? Where is the determination to get better by skiing a little over your head? Where is the excitement? I will be 60 when the 14/15 season begins which will be my 43rd consecutive season, and I guarantee you that I still push myself to get better.
I remember back when I was a Safety Ranger at 7 Springs, I would ride up with an instructor friend and ask if they want to run the bumps together. Oh no, I don't ski bumps unless a student asks. OK, how about a run through the trees then? Oh no, I don't trees. OK, where would you like to ski? How about down this nice groomed run? OK, have fun, I will catch you later and off to the bumps or trees I would go.
I know it is a little different out west at the big resorts. I have had some awesome lessons from instructors who were up for anything. But even out there I have gotten the occasional, well, if you really want to I guess we can hit the bumps, response.
So tell me why do some instructors stop pushing themselves to get better?