I use it, works great but it would be awesome to be able to then turn the gold ore into counterfeit gold coins, it could even have its own quest attached.
A gold coin is just a chunk of gold with something official stamped on it, which means it's a chunk of gold that has been certified by a governing authority to contain a certain amount of gold and no less. The gold in it isn't worth more because it's in coin form, it's just guaranteed to be worth a certain amount by whoever issued the coin.
So unless you could turn your gold into septims that are part gold and part something less valuable, but still look like they contain the same amount of gold as a "real" septim... there'd really be no point. Gold is gold, a chunk the size and weight of a septim is worth exactly a septim. There'd be no profit in it unless you had a way to cut the gold with some other metal that was far less valuable.
And it would still probably be far less profitable than taking the gold you made out of iron ore and forging jewelry with it.
