Alternate Argument for AH...
Perhaps this has been brought up in the past within previous comments, but for the purpose of bringing attention to it, consider what it would mean if player to player economy becomes much more attractive (even more so than it is with the present wards system)
Gil sinks. That is, the method for retiring currency to make room for new currency, as used in this and other games. The systems in place meant to emulate currency circulation. Printing and retiring of bills etc.
In WOW you may know this is the repair, auction house fees, and flight master costs... training fees, licenses, gizomos and toys.
In FFXIV its bazaar and ward taxes, darkmatter and repair npc costs, and soon we'll have Chocobo and maybe airship tickets.
What ever improved market system we get that makes these gil sinks more attractive will be for the better. Right now the repair gil sink looks to be working more or less fine, and there is no way to comment on transport costs just yet. The Market gil sink though, where we should be seeing the largest chunk of gil removed from the game... is a bit derp.
Right now it seems like other than commodities and a few high price items, there isn't much 'stuff' getting pushed around compared to the volume of sales you might see in games.
With a better, more convenient system for selling items through a middle man (retainers, auction house, consignment, bazaars, pick your poison it doesn't HAVE to be an auction house) we'll see a better flow of cash from who's hoarding it to people who need it, and enough leaving the system that there is reason to get MORE of it.
But right now? We're seeing gil moved into a server faster than it can be moved out. Players are hoarding it (in another thread this appears to be to the tune of high millions or low billions). This is money that isn't moving anywhere any time soon and is just sitting there waiting for SOMETHING to be spent, on that really doesn't come. Other than giving it to other players to hoard, there just isn't anything to do with it. We're getting TOO MUCH.
As far as what this better, shinier means to sell stuff to other players? Honestly what we end up getting and the form it takes really isn't important, as long as its convenient and easy to use, being quick would be a definite plus. These words don't exactly describe what methods for player to player sales we have right now.
Auction house? Improved Market Wards? Door to Door Retainer Sales? Call it what ever and do what ever, but it needs to be easier.
And yes, every server is a small enough playerbase that there isn't much reason for a AH or what ever. It's more convenient to just get in touch with someone and pay them directly, cutting out any tax and with it, any loss of gil. What needs to happen is to make it EVEN EASIER to sell stuff through the game. If anything putting in a good system now will bear fruits when the game hits re-release time.
We could just make one or two MASSIVE gil sinks sure; have an NPC sell 5 million gold plated undies and make it so every player would want it... but that would be a bit to blatant for how SE usually rolls.
I'm sure Scrooge McDuck and his money pool would definitely disagree though.
To sum up:
Improved player to middleman to player sale system would:
KEEP:
Taxes: A % of the sale is removed from the economy. 5-10% is what we're seeing in markets, and this is perfectly fine (it's the lack of volume that is the problem)
ADD:
Posting Fees: Every time an item is listed for the sale, a portion of the profit is put into fees.
Reason to Earn: With gil leaving the economy, there is more reason to go get more. The value of a gil will go up and down but with the right balance of sink to add, hopefully won't bloat to easily.