great game! Liked it all, maybe make items sell for a bit less for balance as that is by far the quickest way to gain energy, especially the material cases sell for to much :)
I mean, the loot needs something valuable. It just happened to that everyone Looooooves material cases.
of course an obvious thought is to make it random every prestiege or every outpost buys their own thibg at high price, making trade convoys a viable strat.