I am sure others have mentioned some of these, but would be great to 'continue' the VIP experience past 12. Some ideas that spring to mind are:
VIP 13 - Remove the cooldown on allowing a map transition. So many times I enter a zone to see a broadcast to go to map X, then miss out
VIP 14 - Gain PE (Protectors Enclave) Garden key, gain ability to teleport directly to PE Garden
VIP 15 - Teleport directly to PE - Throne room (or outer courtyard)
VIP 16 - Guaranteed marks drop, any zone (I am thinking Hunters Marks in Chult here, but I am sure there are other zones where this may also apply)
VIP 17 - Auto Tend all plots in Stronghold - have a special option with Steward in Stronghold to Tend all Plots.
VIP 18 - Improved RNG results - All RNG on opening or receiving an item are improved by 10%