There are some items which are very rarely on the AH. They don't sell well, because they are rarely available, so no one looks for them on the AH, so they don't sell well when they are there. It's something of a vicious cycle. No one wants to fill their Ah sales slots with something unlikely to move nor walk around with an inventory full of junk in their bazaar.
But what is there was a way for players to redistribute goods and farmed drops while still leaving their AH slots free for fast moving or high priced objects?
The solution to this already exists. Guild Vendors. They buy items at a higher rate than selling them to vendor, and sell things that are sold to them with a mark up that decreases the more they have in inventory.
Imagine non-Guild specific vendors, perhaps dealing in specific item types(Weapons, Armour, Pet Jug ingredients, things that are made or farmed to be NPCed already), with a list of items like guild and Tenshodo vendors have.
Sellers can make slightly more gil, at least until saturation levels are reached, buyers can find items that might not be otherwise available to them, and buy them at a somewhat higher price, thus removing a certain amount of gil from the economy and slowing inflation.
Let's look at an example selected at random: Beast Blood. Normally NPCs for 262~279 gil, depending on fame. A Trading Post Vendor would buy this for 200~350 gil, depending on stock. For the sake of round numbers, let's say the TPV has a max stock of 1200 or 100 stacks. The price would change by 15 gil for every 10 stacks in stock. So with 0 Beast Blood in stock the TPV would buy for 350, then 275 with 50 stacks in stock, and 200 with 100 stacks in stock.
The TPV would then sell the Beast Blood to other players for 400~700 gil again depending on stock.
Selling on the AH would still make sense if you have demand, a price of 3k~5k gives sellers more of a profit and buyer's more of a savings than selling to Trading Post Vendor, but if you're in a hurry, or things aren't moving/available on the AH, this would make a handy alternative.
(The above is just an example mock up, and in no way a suggestion for specific prices, stock levels, or items. Void in Arizona, your mileage may vary, all rights reserved.)
Something like this could cover low and mid level armour and weapons, as well as some of the harder to find crafting ingredients that people get and don't know what to do with. Since the sales lists would be decided by SE they could leave off any items that might prove problematic, and even change them from time to time.
And now I call upon my fellow Forum goers to examine this idea and tell me what's wrong with it. Don't nitpick the example, it's just a mock up, and I'm not going to deal with it. Please focus on the base idea.
Thank you for your time.