Different items being in demand at different places is most certainly SC game design. Now, I'm not saying you couldn't try to sell an assortment of chaff to a community of NPC farmers, I'm just saying that someone who owns a ship might be more inclined to buy it, and that when your primary mode of attracting new customers is having them land on your landing pads, you tend to meet more people who came with ships. These things will probably influence what sort of items you're stocking up on, I'm not saying you can't stock up on whatever you want, just that you probably find certain types of items more profitable based on where you sell and who you sell to.You're making a lot of assumptions here that don't really sound like SC game design. There are no defined rails on what I can and can't sell out of a BMM. I can sell whatever the hell fits down the lift to whoever is buying. If I wanted to blast through a blockade and land in the middle of a warzone to sell strawberry flavored popcicles, it is my prerogative to do so. That being said, Will I be able to refuel folks? Perform repairs? Fight off attackers to keep my docked patrons' ships safe? God no. Each ship will have its lane, but none will conquer all.