The Auction of the damned held by the merchant Grimvul came only once in one hundred and one years and was guaranteed to have brilliant items and treasures up for sale.
As such, there was no way these demons would miss their chance to flaunt their riches to their rivals, factions and enemies. In a way, acquiring treasure from the auction of the damned where all the demons fought tooth and nail for the items, was a sign of individual strength and status.
So by flashing the artefacts you got hold of not only are you indirectly showcasing your authority, but you are also making the ones that bid the item against you yet were unable to win against you, to burn in jealousy.
Thus accomplishing two goals at once.
