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Besides just trading/upgrading, you might want to encourage team play.
You could introduce some NPC aliens "ala borg" that make players cooperate.
The borg computer player is ALWAYS playing, so it has the upperhand over us humans that need sleep.
In order for players to keep playing, the world needs to keep evolving. This is why MUDs are so popular. The wiz''s keep adding levels and items and creatures and things.
It would be cool if I was playing this space sim for a month, then there was wan upgrade that let me higher engineers. Or maybe I could fly a freighter that could hold other players, and we could launch a massive assault on other players... etc.
-Gelf