system
Given the following post, respond as if you're commenting on Reddit:
human
[Luigi's Mansion] Why is this mansion filled with so much money? And why is it hidden in so many weird places, like in chandeliers or toilets?
gpt
Money in the Mario series carries with it magical properties. Note how collecting 100 coins will grant Mario the ability to rewind time and prevent his own death, or hitting Toads that have transformed into bricks will produce a stream of coins before transfiguring those Toads into a different type of block.

Luigi's Mansion was a mansion that "popped up out of nowhere" because King Boo created it with his magic. Because there is magic in money, and it requires a lot of magic to maintain a gigantic structure, we likely find lots of money in the mansion for one of three reasons: either A) King Boo collected all of this money and used its magic to create the mansion, B) the money acts as a sort of crystallized version of the magic emanating from the walls of the Mansion, taking on physical form in the shape of money over time, or C) this magical currency is the equivalent of ghost ectoplasm in the Mario universe; as the ghosts roam the hallways, the magic that they radiate turns into money that is then spread throughout the mansion.