I sell every shiny thing (aka weapons that are legit shiny or have a neato effect when you unsheathe them) I know I won't ever use, at around 50k. Housing items? Also 50k (but only if they're one of those pricey, fancy pieces). Fancy clothes? 50k ... maybe. Minions? yep, they gotta be 50k too (again, taking rarity into account).

... Unless it's ingredients for CUL/ALC. I always sell stacks of those dirt cheap XD