For the operating costs, don't forget to include taxes, insurance, utility, and last but not least, maintenance.
High-country or snow-country homes cost money to maintain, particularly if they are constructed with wood that needs to be stained or repaired often. My home is in its 10th year. In the last 3 years, it cost me $22K for repair. I do yearly maintenance myself with the staining, but some wood still rots and cracks.
Composite siding and deck cost more, but are worthwhile in the long run. Some say they like the natural look of wood, but they are either ignorant of the maintenance cost, or rich enough to keep writing checks. These locations have a contingency of carpenters and builders to service the weekenders' homes. There's nothing else to make money on around here.