I am somewhat knowledgeable in economics (9 credit hours) but I don't think that this game is in need of a Gil sink. The current taxes on the market wards provide this quite effectively. The higher prices get, the more Gil is taken out through taxes. However I agree that incentives to purchase items need to be added. I think the economy will start to be more stable with 1.18 as hopefully fixes to the battle system will create these incentives.