It's ridiculous that anyone would pay full price to ski at Vail. Lots of great mountains in that area that you could get 2 days of skiing for the price that Vail charges for one day. That's just me though and as long as people continue to pay, they will continue to charge.
Lot's of twofers used to float around for Copper/Winter Park.
If I was gonna pay the day ticket for Vail I would keep driving and give that money to Aspen or Telluride any day of the week