No, the discount is less than the advance purchase price. See below.
Also, they do not send you a voucher. They just tell you to pick up your tickets at Will Call (which is any guest services location; even at your resort), although some CMs did send DVC members their tickets instead of making them do will call but I wouldn't count on that.
Advance Purchase Savings Price (including taxes):
Adult (age 10+) $41.49
Child (age 3-9) $35.10
Advance Purchase available starting May 1, 2007.
Tickets must be purchased at least 1 day prior to event.
Select nights only. Advance ticket savings of $7 per ticket are available for all nights except: Friday 9/21, Friday 9/28, Friday 10/05, Friday 10/12, Thursday 10/18, Thursday 10/25, Friday 10/26, and Wednesday 10/31.
DVC or Passholder Advance Purchase Savings Price
(including taxes):
Adult (age 10+) $38.29
Child (age 3-9) $31.90