I was kinda curious about this when I heard today. It just seems like a lot of work to get some more money out of the customer, but maybe it's worth it to them?

The reason I think so is sorta based on a couple scenarios. Say that I don't have the expansion on the PS4 but I have it on PC and I own both version (it could also be you accessing from a friend's machine). If the avatar is in the new area or has the gem for the new job does it just teleport you out or unequip it if you sign on from a different machine? Just seems kinds confusing to me.