I made 100k profit off a levitating sombrero on the first day it came out. I think people thought the South of the Border dungeon ws only open on Halloween.
If you're the first one to sell an item it can go for a lot. 100k isn't much, if someone was collecting familiars and doing something else it'd be worth it for the saved adventures if nothing else. When MicroMechs first turned up I bought mine for 200k, just so I could ascend with it without waiting for the price to go down.