Actually, for Feng Jun, paying with food would be more cost-effective because... the price of grain in the Mobile Phone Plane is not cheap.
For example, one silver dollar is worth a thousand copper coins, and a pound of flour needs around forty copper coins, which means one silver dollar is worth twenty-five pounds of flour, and one tael of Gold can buy two thousand five hundred pounds of flour, which is one and a quarter tons.
One tael of Gold is fifty grams, and it can sell for around twelve thousand in the Earth Realm. If purchased in bulk, one could at least buy close to four tons of flour — after all, the goal is to eat enough, not necessarily to eat well.
That is the price when the weather in the Mobile Phone Plane is fair; once there's a natural disaster or chaos from war, grain prices will skyrocket.
