Space traders buy an item multiple times

[supermichael777]

Not sure what causes this but space trader NPCs will pay for the same item (as in one bar of gold for example) multiple times.

I suspect it has something to do with stack or material values, but i'm not sure.

Note i was able to sell skulls to the martian once or twice but a gold bar 10 times.

[Anticheese]

I was able to do this last night and was actually just about to post this in Exploits.

It seems like SOMETIMES the item gets deleted, but it takes a bunch of real-world minutes to happen. When it does, the NPC still seems to be "holding" the item, but it won't give you any more cash until you put in a new item.