Wormholes

• how many market slots do you think this needs?
I mean, a decent market in hisec has the capability to holdall 8-9000 or whatever (nerds, find the number) of possible items on the market. In w-space you may not need Yan-Jung Relic items and the like, but even setting up markets with slots sufficient for ammunition alone would have about 300 different types. Even if you just consider popular ammunition types, you're well over 120 different types of ammo.

• Who is going to use it?
As pointed out before, a lot of corporations have a public hangar bay, usually slot 1, where the corporation places items (such as ammo) for general usage. This doesn't break anything, it may cost your corp some cash, and probably ends up stolen or lost if the CHA is blown up, but so what? It obviates the need to install a market facility which is on a per system (in fact, per POS) basis.

• On that note, think about the programming needed.
The market function in EVE is simply a database functionality similar in operation to a publicly viewable webshop which allows the users to browse all available instances of market calls and puts. This is in essence similar to a stock market, restricted region by region. To create a new market for one POS would require CCP to create a functional database FROM SCRATCH whenever you anchor a POS Market Array, and then uninstall the database structure LIVE and in REAL TIME whenever you unachor it and decide to move it away from your SMA because your mother loving Naglfar bumps off it.
Nope. Nope, nope, nope, nope.
Outposts, you will say, are similar. No. outposts are large, hard to manufacture, one per system instances which are added to an existing database (one per k-space region) with plenty of advanced warning to CCP to prepare the database to handle the incoming instance. They also cannot be uninstalled.

• Who's going to sell that much anyway?
I am one of the very, very few toons in EVE with Tycoon trained to level 4. At level 4 i have 329 maximum open market orders. If we had a POS Market Array I would, personally, not even be able to fill all ammo orders on market myself. The majority of toons have less than 100K skill points in Trade. How functional would a wormhole market be? Especially considering it will likely be available to corporation only. Even in nullsec, you can conduct economic warfare via remote buy and sell orders in regions where you cannot dock due to standings.

• Will such markets be available on the market browser?
In nullsec, as said above, you can jump into eg; Curse or Deklein, and open your market tab and prior to an invasion, drop 200M ISK to buy up all the cynosural field generator modules on market, and 500M to clear out the stocks of Liquid Ozone, and re-seed them onto market at astronomical prices.
how will this work in wormholes? Is the market only visible to members of a corporation? is it only visisble to those within 3km of the POS Market Array? if not, someone can drop into system and clean you out and flip your goods.

• What happens to the goods on market when the array is unanchored or destroyed?
Thanks, CEO dude, for letting eg; Blood union vape our POS. i just lost 30 fitted Guardian hulls i was sure you'dd buy for an exhoorbitant markup but never did, so they sat around on market for months and everyone just went to jjita to buy and fit new ones themselves. But now they're all gone into the aether or dropped out of the POS Market Array (damn you loot fairy) and i got no insurance on them.

QED, this idea is impractical, stupid, and sucks the donkey.

I can see reasons not to implement this if you primarily and almost exclusively shop for items outside your home, and no one in the hole produces anything useful for the corp. Otherwise, this is a quality-of-life (tm), time-saving (tm), convenience feature (tm) to make it easier for corp or alliance mates to support one another more efficiently: it encourages the community aspect of a corp/alliance. It cuts out the shared spreadsheets, "market forum" waste of timecoordination, and repeated requests on chat/comms for products.

I can't imagine such a service ever making a corp so self-sufficient that they never need go out to K-space.

I only got weekly updates, so I see quite clearly what happened. And I blame you, 10/10 times.

Edit:
Let me put it this way: I'm more often at those POCOs than I see aquila online.