Well I am a rich player... I've worked my tail off to get my gil, And as such I don't believe that my gil should be rest to 0 with the newer people.
There are two key problems affecting the massive influx of gil:
1. No Proper Gil-Sinks- Aside from the airship fee of 5,000G, there aren't any other gil-sinks in the game to remove gil constantly from the economy (At least as reliably as the airship does). There's no reason to rent a Chocobo once you get your own gil-free bird. Lastly, there's no reason to consistently (key word) use the repair NPC/dark matter vendors to repair your gear when you get 1-2 stacks of Grade 5 Dark Matter from Ifrit because the weapon drop rate sucks and you have to spam the fight (Or you have LS Mates who can use some of their 1-2 stacks from Ifrit to repair your gear for free).
The only properly working gil-sink as of now is the airship... If SE wishes to remove more gil from the game, useful sinks are needed.
2. Unsustainable Demand for Food & Gear- This is another problem because the demand for food items is basically non-existent until ALL (Not just the 2-3 current items) food becomes useful. This will hopefully be rectified soon, but until then... it remains a problem.
Gear on the other hand has little to no demand after the "new" factor wears off. I know what your about to say... "They implemented the materia system! Gear should still have a demand!!" Well, your partly right & partly wrong. Gear indeed does have a higher demand, but only specific pieces of gear.. Not gear as a whole.
Key example kids: If Bayohne or Rukkirii were looking to materialize some gear.. Wouldn't it make sense for them to buy the item that costs 30k (More like 2-3k if you actually make it) that has a high chance of getting materia that's worth 250k+, rather than buy the item that costs 100k+ and is known to get nothing but junk? Anyone with half a brain would say they're going to buy the 30k item... because if it makes a materia that's worth a lot (Even if it's one they don't need) they can turn around and sell it. Then they can buy whatever materia they want with the gil.
There is no demand for the Robes, Haubergeons, etc. because they can be made for a fraction of the 200k+ they sell for. Secondly, why would I buy that to materialize when I can buy a Mythrill Wristlet (Which I can wear two of) for like 15-30k? Demand for gear isn't balanced partly because of this.
If SE can find solutions to these two problems there would be a lot less gil in the economy. I don't know what exactly could be done, but anyone with an idea could possibly help me out further.