Gil sinks

[Jojoya]

If anything, gil sinks tend to harm the economy by adding to inflation.

You have it backwards. Inflation isn't caused by a lack of currency in the system. It's caused by an excess of currency in the system.

The more currency a player has, the more they can spend on one item. That causes prices to increase as sellers take advantage of the greater wealth. If players had less currency, they wouldn't be able to spend as much and so sellers would need to reduce prices to find buyers.

For us to have less currency so prices stay lower, we need to have more things to purchase with gil.