Just heard back from IK...they said the reason I'm not seeing the upgrade price is that I must have gotten my original SVX in a bundle...and that that is why the upgrade price is not showing and also why it's not showing up in my "upgrades/crossgrades" section in my user account.
Only...I didn't get it in a bundle. I bought it as a totally separate plugin when it first came out. Back in 2007.
So...I told them that and maybe they can fix it. We'll see.
Maybe Peter can chime in and give me some help.