So shulkers got banned from /ah because you are able to put dirt in it and sell it there but.. wouldnt it be smarter to disable putting dirt in shulkers like keys? Shulkers were banned so you cant dirt trade but... you can still drop shulkers with dirt who would prefer seller dirt in a shulker in /ah when you can just drop them.. My suggestion is to unban shulkers from /ah and disable putting dirt into shulkers just like keys. =)
Support, though my main apprehension is not being able to see the full contents of a shulker, so I doubt I'd be buying many.
