suggestion against self cleaning stuff: you want to show you can afford to pay people or for automatons to clean your stuff for you.
on the luxury as conspicuous consumption
intricate furniture made out of expensive materials that disintegrates after a few days (or cloth that does so)
wines made from necromantic grapes; must be picked in the dark of the night, and throughout the extraction, fermentation, aging, and bottling, the grapes are never exposed to light or positive energy; the bottle is made of fused darksand, the wine itself is sweet, with a faint taste of rot and time; the liquid is nearly black, with bright lavender tones, only a couple bottles are made each decade.