My question is, how much is a Gil worth in real world terms? It is 1 yen, 1 US dollar, 10 US cents, 1 GBP?

I see Thancred investing in the entertainment sector as it's a good way to get information and would give him an excuse to be in different places all the time.

Y'shtola and Urianger would invest in adventuring parties to bring back relics

Krile would invest in mineral concerns, businesses entering the Ala Mhigan market, and shipping.

Tataru's invested in a coffee biscuit production company, real estate, Ceruleum exploration, Rowena, and whatever passes for a mutual fund.