Скачать или смотреть What money grinding looks like in Atelier (Sophie 2)

All that effort for a little bit of money. This is why you should balance your game's economy.

Probably could've been better if I bothered to put golden glow on the neutralizers but I couldn't be bothererd to check how to transfer a puniball trait to a neutralizer.

The whole idea is reducing your duplication costs as low as possible and making a cheap item with a few cost-increasing traits like overpriced.
Thanks to the flat increase of those traits it's very possible to end up with an item that's cheaper to duplicate than what you get for selling it, though I don't know what the exact money is.
Easy low effort money is easy low effort money though.

For what it's worth Ryza 3 also has a similiar trick involving the Ultra Purity trait.