Pros
Ski time without a doubt. You won't ski on Saturday or Sundays but you will the rest of the week if your legs can keep up.
Montgenevre season pass includes free ski days at resorts like Alp d'Huez, 2alps, Via Lattea and Puy St-Vincent as well as Spa sessions.
You will be doing a season in one of the most underrated ski resorts in France, but shhhh...keep it quiet
Cons
Flights do often get delayed or cancelled which for a driver means last minute rescheduling which might lead to long transfer days/weekends. Not a massive downside in my opinion.