Path of Exile crafting is like this, except it takes hours of grinding to get any reasonable amount of currency (you use up currency to do crafting, basically). Very satisfying to create a really nice item though, and if you make a truly top tier item, people will pay you to make copies of it for them (there's a currency type that copies items, so they give you one of those, you copy the item, and they pay you the copying fee to get the freshly-made copy).