Yes but you making 1.5 million gil on the Market Wards isn't the same thing at all. That's just gil that's getting transfered between people and the gil has no real effect on the economy as a whole. When millions of gil are coming out of nowhere (NPCing things by the thousands) that's a real problem. That's a huge amount of gil that's being introduced into the system all at once and will definitely cause an inflation, its severity dependant on how much this is actually being done. They should have made the stuff unNPCable or increased the price of the items in seals, if they did that even slightly it'd have been better than what could be a major inflation.