I've supported this for a very long time. It's sensible and logical and supported by a vast majority of sci-fi out there.
We don't need thousands of cubic tons of storage space. In fact, we shouldn't have thousands of cubic tons of storage space.
But we do hear regular cries for Credit Sinks, for things to do with Credits, and we've heard plenty of people wanting to be able to stash some cargo, if for no other reason, to allow them to purchase another ship, or switch to a different ship for any number of reasons. So...
Let's be reasonable. Allow each commander the option to purchase, in game, a singular cargo storage unit on large stations (not outposts), in a class that best suits their needs.
1E (2 tons) - 10,000 Cr initial cost - 1000 Cr Weekly Maintenance Cost
2E (4 tons) - 20,000 Cr initial cost - 2000 Cr Weekly Maintenance Cost
3E (8 tons) - 40,000 Cr initial cost - 4000 Cr Weekly Maintenance Cost
4E (16 tons) - 80,000 Cr initial cost - 8000 Cr Weekly Maintenance Cost
5E (32 tons) - 160,000 Cr initial cost - 16,000 Cr Weekly Maintenance Cost
6E (64 tons) - 320,000 Cr initial cost - 32,000 Cr Weekly Maintenance Cost
7E (128 tons) - 640,000 Cr initial cost - 64,000 Cr Weekly Maintenance Cost
8E (256 tons) - 1,280,000 Cr initial cost - 128,000 Cr Weekly Maintenance Cost
So how does this work? Well, we'll need a new Contact in Station Contacts, the Assay Office.
From the Assay Office, you purchase your storage capacity for the initial cost. This affords you that capacity of cargo storage.
You may then use that cargo storage just like you would module storage.
Each week you are assessed a maintenance fee for having the reserved storage space, regardless if you actually have anything stored there or not.
If you do not pay the weekly maintenance cost, you forfeit any materials stored and lose your storage space.
Just like Module storage, this capacity is a singular instance, but is available at any station offering Assay services. You can tranfer stored materials between stations, just like you would transfer modules, with one exception: You must transport the entire stored cargo unit, rather than individual cargo items - so if you have a 256 ton store, you must transfer the entire 256 ton store, not just that one item you want. Costs to transfer should be about half-way between the cost of module transfer and ship transfer, with longer transport ranges having increased costs.
Illicit or Stole Cargo can ONLY be stored at Assay Offices in Anarchy systems, and only transferred to Assay Offices in Anarchy systems. It only takes 1 piece of illicit or stolen cargo to be stored for the entire lot to be restricted to Anarchy systems.
Rare Goods in storage are still considered part of your Rare Goods allotment. If you buy a Leathery Egg at Ridley Scott station and store in EZ Aquarii, you still have 1 Leathery Egg and cannot purchase another one until you rid yourself of that 1 Leathery Egg.
The benefits of this have to outweigh all possible cons. Some limited cargo storage is certainly better than none at all.
Yes, it's somewhat expensive, somewhat restrictive, and continues to cost credits every week. The costs, however, are somewhat minor and well within even a fairly new commander's means, with some effort.
And this affords another opportunity - the generation of Transport ships, with cargoes based on the data taken from Stored Cargo.
This means the potential for more interesting NPC Piracy. Imagine:
You're hunting around Anarchy space for NPC's to rob. You spot a Type-7 leaving a station and give it a quick manifest scan. That ship contains 25 Modular Terminals, stored up by some commander to unlock Marco Qwent, along with a dozen meta-alloys, a few Ancient Relics, some Jadite and Hutton Mug.
All data taken from the Stored Cargo database. This isn't that particular commander's actual stored cargo, but a representation of it, meaning as a pirate you have opportunities to find more varied and interesting cargo on transport ships. You may not actually be stealing someone's actual stored cargo, but it has the feeling of doing so, and it helps spice up what's out there to be found.
So, commanders, while your actual stored cargo is safe and like your ships and modules, will always reach their destinations, cargo manifests can be generated based on the kinds of things you store. It's a win-win - with a side of win.
The limited capacity does prevent overt hoarding to preserve the delicate balance of the galactic economy that doesn't really exist, so no one is going to auto-win a CG bsed on stored cargo, nor upset the balance of supply and demand.