It is for Multiplayer SP I like doing the Campain and then it starts to get a bit boring because of no new interaction.
I know the "trick" with creating one character to fly around the whole universe, visit every base, buy 1 item of each commodity and then check the prize each day on this character and then trade with another character. Not sure if that is what I would prefere as the kind of "roleplay" because you then have a multiple personality "issue" xD and it is very much time to invest.