Neutral shops carry two major advantages over normal shops~
1) There is no one to evict you from a neutral shop.
2) There is no TAX on a neutral shop. (SEE EDIT)
Edit:
Proof there is no hub-tax of a 100 gold purchase:
Before purchase:

After purchase:

But in Andunor? Even worse:
3) They have an advertising advantage.
This puts districts at a significant disadvantage to normal shops, and even at a significant disadvantage economically compared to OTHER SETTLEMENTS. Given that other settlements frequently seek to gain an advantage by interfering in Andunorian politics... (including bidding millions of gold in Andunorian property auctions to try to get them to accuse each other of breaking alliances and agreements they did not) ... I think that aside from the ability to ouster groups from significant guild halls, the districts (the settlements) themselves have largely lost economic relevance in Andunor.
To correct this, I would like to provide some feedback:
1) While I understand that the current system works fine for settlements such as Cordor and Brogenstien, that has so many shops and quarters that their economy is booming.. a large majority of Andunor's economy does not PASS through the settlement systems... which makes the large effort of managing these settlements often more about subsidizing their needs with your own wallet rather than about managing the resources of a settlement.
2) This gets even more difficult with The Devil's Table, because the Devil's Table requires -additional- politicking that cannot be avoided because it is inherent in The Council System... the devil's table, even worse does not produce enough gold to provide a wage for the headache of managing the district, let alone for any corruption or evil-style embezzlement of funds.... Frankly: My neutral shop produces more gold than the entire GDP of the Devil's Table with all of it's shops, houses and guild-halls full, and I suspect this is the same for The Sharps... and this is NOT good ... when you realize there are /three/ councilors. This does not spread out the stress across three individuals. This amplifies it.
3) Even if both The Sharps and The Devil's Table were pushed together to create a single settlement north of the hub: I suspect that the Neutral Trade Hub would -still- harm its economy and ability to defend itself economically against interference by other settlements because of other settlements abilities to interfere in its auctions... and I suspect it STILL would not produce enough gold to be worth the headache.
4) Because of the size of the gold pile... it is STILL enough to encourage individuals to run for office SIMPLY to steal the treasury if there is no competition ... but it is NOT economically viable to /run/ for Andorian office with intent to run the district: Unless you produce a LOT of gold independently of the district... you will never succeed in subsidizing the millions of gold required to bid on properties ... and even making alliances with the other district to try to lower these costs does not prevent outsiders from inserting ridiculous amounts of gold into the auctions that they are incapable of benefitting from (since you can't bid for Cordor to 'steal the property'... they can only bid for The Sharps or the Devil's Table, even though the option visibly exists to select Cordor, Brogenstien, etc)... with the sole intention of screwing with the politicians wallets.
5) My suggestion? 1) I'd like to see a 10 - 20% tax put on neutral shops to encourage in-settlement trading.. which would allow settlements to lower their taxes so that their prices can be competitive with neutral shops and possibly split down the middle between the districts -- specifically those in the trade hub that people cannot be evicted from.... and? Alternatively to this? A system put in place to prevent those who are NOT elected officials... from bidding on the city property so that it is possible to actually honor alliances without some merchant from Cordor dropping 5 million gold onto a property he cannot benefit from, on "behalf" of a faction he is not apart of, which will not produce 5 million gold in the time it is owned by the district. Preventing non-outcasts from bidding does not accomplish this... they simply give it to one of their friends Outcast alts and bid that way with a substantial or non-substantial "bribe" in gold that they don't value, and that they trust their friend not to use against them.
6) I have yet to see an election cycle where this is not relevant. Most of these ecconomic issues would be fine ... if outsiders couldn't bid in ways contrary to the elected officials interests.
7) Additional idea: What if we automatically attributed the taxation of the shop to a place you're a citizen of if the shop is outside of a settlement?