Apologies for the rant to follow but, after thinking about it a bit more, I need to get this out of my head.
When I said NPC's I could have been more specific; a lot more specific.
Galactic Materials Economy Model:
Legal framework:
All materials salvage is legal removing the need for black market interactions, lawful interdiction above the normal game requirements of system authorities and fines etc.
Valuation:
Values across the board could be kept very shallow and non-competitive. Turning over 20 shield emitters for a couple of credits each isn't going to unbalance the overall galactic economy game mechanic. It's just a way of offloading your excess.
Channel(s):
Channel is sell to market only. This prevents players buying into Engineers perks. If you want the mats you go search for 'em.
Framework(s):
1. Engineers (of course). As mentioned above perhaps percentage offsets of a few points against RNG rolls if you have excess materials to trade.
2. Commodities sub-market. Platforms, starports and landfalls. Values are small credit returns.
3. Faction missions. Donate 20 shield emitters to our war fleet program. Values are in Rep+ and Inf+
4. CG's. It is what it is. Faction is building a war fleet this week. Bring shield emitters quick! Civil war. Protect our borders etc.
5. Seeking Materials ships. Values are small credit returns.
6. Powerplay. Values returned are a small merits boost (against the weekly cycle).
7. Alien civilisation(?) All of the above with a translator?
Game mechanic:
Since the model uses and returns to the player very low values the overall impact of this mechanic may be a viable alternative to storage? Keeping materials flowing in and out of inventories means that harvesting them in space, or on the ground, never gets old.
If storage keep inventories "static" (except for Engineers usage) a rudimentary materials market place would "cycle" inventories a bit and create some inventory management choice that is not available with storage (storage being, in effect, an extended inventory).
I haven't yet reached the inventory limit but what happens then? I get my interstellar girlfriend to continually give me inventory full messages?
In saying all this I haven't even touched the Engineers so I don't know how this economic model affects the depth of that mechanic and the ongoing demand for materials works at all.
I think that's it..... rant ends.
Cmdr Pingmonster out.