The suggestions are really good on this.
But I feel that certain items, despite being pk use like ags(arma hilt), shouldn't be included in bh shop. GWD rewards should stay there.
In addition, I think d def and MA2 capes should remain a how they are obtained. Pkers want to risk what they want to. If you lose it, you get it back the original way. One way we can have some sort of money sink is to have TrouverParchment(something to prevent you from losing untradables above 20+ wild).
Also, having things like 1tick ags/gmaul would help a little of the pk community too