I really like the idea of upgrading the prayers, but I'm struggling to understand why they will be untradeable. These upgrades would be massive for late game players trying to complete the inferno
Edit : the poll doesn't mention anything about the scrolls being polled with untradeable or tradeable versions. I'm not an iron-man, I want to sell my loot or dupes.
If you're trying to complete the Inferno and you're a lategame player, you'd likely have very limited interest in there. The untradeability is just to serve as a chase item for the target audience to have an excuse to get really comfortable with switching while chasing a really impactful unlock for their account!