Early purchasers at OKW and VB got free admission passes to the parks when staying at OKW. That program ran thru 1999 for those purchasers, BUT ... those who purchased after 1995 did not have that as an option (it was never available to those who bought at HH or BWV) - that is when the 10% discount became available for Length-of-Stay (LOS) passes ( which later went by a variety of other names - UHP, UMP, etc.).
When the $100 discount on Annual Passes (AP) was offered (beginning January, 2005), the 10% discount was no longer offered on any other passes. The current MYW passes do offer their own form of discount and currently have not been discounted except for advance purchase, so it's not likely that a discount will be offered for MYW, at least for awhile.
I expect the AP discount program to be available for a ling time.