I think a more effective gil sink would be adding a gil cost to glamour plates. Nothing crazy, but if it was like 5k a swap that would add up.

It's hard because you really don't need gil for anything as an average player. I mean maybe teleports, but there's nothing to passively take gil out of the economy. Housing doesn't even work because people have 100s of millions and the house didn't put a dent in that. Also you don't need a house so.