Ooh I like the semi-permeable walls! Won't spoil, but I saw one of the objects and though "wait a minute...".
On the note of traversal, I may be missing something, but I think if you could sell the goods at different places and/or there were timed flash sales in different places, it would incentivize running around in chaos mode. As it was, I mostly timed a few markets in the same area over and over and was never really at risk of having my futures expire.