Re: Inanimate sacrifice in Thaumathology
 

It's cheap, but it's also generally supposed to involve rare materials.

I plan on allowing inanimate sacrifice for my Dungeon Fantasy game but only for unusual items that are found in areas that adventurers tend to be exploring. Crystals found in the Caves of Chaos, parts harvested from overtly magical critters, mithril ore found in the high-mana zones of abandoned Dwarven mines, or the phylactery of a lich, etc.

Just like with magic items, my PCs have to work for it... :)