Lots of things. Shorter season, snow making costs, night operations, and such. Let's also not forget, that if you are a visitor to Colorado, and most other destination places, your lift ticket is costing you $100 a day. Cheaper passes for locals are subsidized by higher lift ticket costs. I am sure that operating expense for say Snowbird for a season is way more expensive than Boyne, but they have a longer season and a much higher number of visits. I'd bet skier visits at Winterpark are probably in the neighborhood of 10x the number of any given Med West resort. That is a lot of money.