The National Ski Areas Association has the data you need (Economic Analysis of United States Ski Areas ), but it costs $400. If you're really nice, you might find a resort that will let you read their copy of it. Try calling the marketing department and scheduling a personal visit before the fall busy season starts. Data for a particular resort is proprietary, getting exact numbers is probably out of the question. Annual reports from the public owned ski corporations might give you some useful data.
One sneaky way to do an analysis of a resort's profitability is to estimate the prior season's profit based on the next season's capital improvement budget. It's not always true (e.g. when there is an operating loss), but there is usually a close relationship for many resorts.