BH store items are merched to hell, so keeping the orbs out of there is good. Putting them in the LMS store could revitalize the minigame, but if it dies again despite the orbs addition, they really ought be added elsewhere also. Also, those prices seem a bit overboard.
I'd prefer the Nightmare staff in the pkp store; just to make it less of a hassle to buy. Ignoring that you can't bash to any effect, it really isn't much worse than sotd/variants so, given you can add the orbs, it shouldn't be less than 2.5k. More than 2.5k, though, and very few people will bother using it w/o an orb since it's just fashion honestly.
Inquisitor's mace being 15k in the BH store, following the rapier/saeldor, is good.
Inquisitor's armour is over-priced, in my opinion, it's not that good. I can't see any mains using it since Bandos is 2k and no average zerk player on roat is going to skull up in that risk. It needs to be reduced in price or it's just dead content for people to look at in their bank.
+1 to Justiciar being severely reduced in price, it's already got fairly limited uses on OSRS let alone roat.