I think VSB is correct. Who wants to ski beyond 4pm anyway? In Winter is dark and cold, especially in steeper valleys like
Chamonix. In Spring best conditions are before lunch, wherever you are.
If people want value to money, first lift is key. Either fresh powder or nicely groomed slopes for carving on. Reality is that if you ski hard from 9-3, that is 5hrs more exercise than someone who goes to gym every day.
Have to say is a very British thing; (will excuse myself as am one) to rock up late skiing and moan about conditions. Even last year in late March there was good skiing to be had for 3 hrs or so in morning. As I was heading home for lunch, so many people just starting out, moaning about the glorious weather and soft snow ?. Few better things in world than having a demi bier, salad chevre chaud, looking up at Mountains and thinking of the Brits moaning about the snow and sun. Food is always better and cheaper in resort so win win win.