Most of them dont care where the energy comes from. All they care is to keep the stream of tourists. I know, I live in a skiing country which is about to face the end of this era. Nobody from the tourism industry is willing to accept the facts, all they do is pretend it can be handled with artificial snow.
"Most of them", you've done a global survey then, have you? Ski resorts here in Colorado very much care and advertise about their renewable energy usage.
Renewable energy is not an infinite resource. It will take eons for us to exhaust the sun's energy with solar panels. But long before that time we will have exhausted our supply of ground minerals that make these panels. You can also only have so many hydra dam installations.
So even if they where using 100% renewable energy. They are 'stealing' that clean energy away from others. So grey energy will still be used to fulfill that demand.