Is there a level requirement to get them?
Before the free upgrade goes away I decided to take our most played characters and get the upgrades done to VI and then do the free upgrade.
My wife's hatchie of 23rd level is getting the text of "you don't qualify for purchasing shares" and the link from Elsa for purchasing shares does nothing.
So ... is there a level requirement you need to be before purchasing upgrades to your vault... I didn't think there were.