I just guesstimated in the $2,500-$5,000 slot as we don't really have a skiing budget, we just plan trips and ski.
That said I buy my mount snow season pass in the spring for the following season, where I teach is free and I get michael's at half off for him, bromley is free since we work there. If we ever need a daily they are heavily discounted or free. Lodging is cheap in the northeast and my jeep fillups go from once a week to twice a week in winter. I'm a deal hunter and rarely buy something unless with one of my discounts. Meals and ski maintenance are mostly heavily discounted.
Much of my number comes from 2 week long ski trips (banff and tahoe). 1 with the ski club and the other on our own.
This is a great thread as it got me to think about what spend throughout winter. However, we don't do a budget for skiing because we pay our bills, put money in savings and take care of that cats and the rest is gravy aka ski money.