I suspect the GMs who go to Roi Soleil (that is what the village is called) do not necessarily post here.
I think, the clientèle is a mix of mostly Italians and Russians and then, a bit of all.
Here's a short discussion about the village. A bit dated though...http://www.clubmedplanet.com/forum/topic.asp?TOPIC_ID=3569&SearchTerms=St.,Moritz
Anyway, the skiing area is top and for all levels. But with the warm weather we are having here right now, the snow may be almost gone by March, unless we get some more... probably this weekend.
The Corvatsch will always be skiable. I once went there in August.
If you want info about St. Moritz and the Engadine Valley, here it is (in Italian