Various skiing/boarding forums have been full of complaints about CMF services. Luggage regularly left behind, or routed via GVA because of loading weight restrictions by Jet2 (ski flights are invariably full luggage allowance plus skis for most pax). I assume that the other players don't want that sort of hassle. CMF use seems to have been driven primarily by seat charter by TUI group companies, although they don't use TUI metal !