Any kind of "item X costs Z dollars in real life and Y gil in the game, that means 1 dollar = Y/Z gil" math is bound to fail and not make any sense, because the comparative prices of various items varied a lot over history, and a lot of the game prices were pulled out of nowhere anyway. And that's before magic enters the equation.
I think the only thing we can agree on is that an average PC/successful adventurer has much more money to spend than an average Eorzean.
I think the only thing we can agree on is that an average PC/successful adventurer has much more money to spend than an average Eorzean.