Gil is worthless because there's no real demand for it outside of a niche thing: housing. Glamour, you can just farm and make yourself, so it's not like you are required to buy it. Housing, on the other hand, will always require gil. Gearing up does not require gil. You can gain these things faster by paying someone else for the items after they did the work, but it's by no means required.

The only game I can honestly say did economy correctly was Black Desert Online: items were a set price. People paid extra for being able to claim items in a queue if they were extremely popular. You could still farm the stuff yourself, and money was ridiculously easy to come by, but at the end of the day, items were a set price and it ran on a first come, first serve basis. Money always had a value.

Disclaimer: I'm not saying this system should be put in place for housing, but for marketboard items, this system would work well in FFXIV.