Well they don't offer manufacturer discounts either, at least I can get $1000 off the sticker price of a new BMW, but who the hell pays the sticker price.
Anyway what I am trying to get at really is that the Apple discount is rather decent and an Apple employee not using it to purchase a computer just so they don't have to wait a few weeks is kind of silly.
At least thats what I was told by a Sr. Sys Admin I used to talk with a lot.