Waivers get court cases thrown out, but a waiver cannot stop someone from sueing.  No document can.  If someone signs a waiver and sues, the resort is still going to have to hire a lawyer to take the case to court on their behalf.  If that lawyer presents the waiver, and wins the case for the resort, the resort still has to chunk down a fair ammount of dough to that lawyer who defended them AND won the case on their behalf.  If customers are getting hurt in parks (which is most often the case now adays) and suing the resorts, even though those cases are being thrown out, it is still costing the resorts money.  Whether a park is worth the amount of money it brings in is debatable, but you need to keep in mind, the number one goal of any ski resort is to MAKE MONEY, not "progress the sport".