The Store has 1 hour "town service" items to call npcs and repair, sell items, use vault, etc. I think it would be a good idea to add similar permanent skills for sale.
I don't buy those 1 hour items. Maybe people with very long subscriptions or lifetime accounts do, since most of them have so much TP. However, if there was a permanent skill that I could buy, it would be very high on my list. I think it could be something similar to the enhanced wallet - account skills at ~1k TP, they could even be integrated into the wallet window.
I would especially want an option to call a provisioner and an item master (relics+forge).