I've read the posts, and the cons brought up are good points. But, as a mom of four, I can't help but think that having an alternative to
$100+/day slope care would make a big difference. Skiing is expensive enough without having to deal with slope care with multiple kids. Now all of my kids are 6 and above, so it's not as big an issue, but in earlier years I would have like it. One BIG BIG BIG pro is that with a ski nanny the kids would have gotten a lot more ski time. I was always disappointed that the all day slope care included only about 1.5 hours of ski time for the littlest ones. $10/hour for somebody to keep a little guy on the magic carpet most of the day? DEAL!! No trees to worry about, a veritable bastion of safety, and somebody is out all day teaching them. And, I'm not a lazy parent. I just knew nothing about skiing and had to have somebody else teach them. I tried teaching Littlest One, and realized it was a disaster. I would have hired you!
As for older children who are on blue and above slopes and can hit trees, I would think harder and want to know about the person's ability to be safe and knowledgable. Safety, safety, safety. You can do this the same way ski schools do this: show education in ski kid safety, credentials, etc. I tend to think the ski schools aren't exactly vetting for experts when they hire. I know the older lady that taught the little kids' lessons for my 4 yo was awesome, but the teens I see in the daycare program aren't exactly creating expectations for excellence.
So, two people with 4 kids, Mom of Reds and me, could see this working. Might be worth investigating it further as a business opportunity!