I read that the payment for a delivery is multiplied with the distance. (Subquestion: does it mean the distance traveled or the direct distance?) Since the overhead of un/loading and repairs is constant, it seems to me that longer distances have a better win/cost ratio.
On the other hand, there are penalties for taking too much time. (Subquestion: do I get more time for longer ways?)
So my question is: for maximum profit, should I transport few goods across the entire map, or should I transport more goods on ways as short as possible?