That's why I made a point of saying that there are TWO kinds of vouchers. A renewal voucher just adds a year to the expiration date of an existing AP. A voucher for a brand new AP (which does cost a bit more) gets you a brand new AP that expires one year from the day you trade in the voucher for the AP.
(first price is w/o DC, second price is with DC discount)
Annual Pass $369.94 $354.04
Annual Pass Renewal $327.54 $316.94
Premium Annual Pass $497.17 $ 475.97
Premium Annual Pass renewal $444.16 $428.26
Unless the rules changed back to the old method, a renewal voucher will not work the way that glo (and the person from the DC) described.