i was rare trading and found that 300k round trip wasnt doing it for me...then i found this
1.6m round trip, takes about an hour and if the stations fill you up on rares before the last one all the better
https://docs.google.com/spreadsheets/d/1RitrGeA_1jL48AcY1NUx6JUEMrFXZhZI7F05Y4cExrQ/pubhtml
Whilst in the Lave area picking up 'rares', nip across to Zaonce (direct) and see if they have any Leathery Eggs for sale at 'Ridley Scott' .
They are expensive @ 25,000 cr each but take them 100 light years away and its a mighty ker-ching.
Belay that advice, bleedin things do NOT increase in value (much) Apparently they are fake and the market knows it!
It doubles in price after 120 ly