It seems to me you are doing it wrong or I have misunderstood what you are trying to do. Only the distance between buy and sell station matters, not the distance you were flying. If you fly a circle and sell it near to the start station then its clear that you gain no profit, no matter how many light years you have crossed.
And the profit value is no line but a curve, so you can skip the galactic average for rare goods. They have a sweet spot around 140 LY. At half distance for example you do not get half value, you simply get nothing worth the effort. So if you are not crossing the optimal distance, normal trades can indeed be the better solution for you. And of course you need a FSD which provides 15 LY jump distance if you want to use that effective.
I made a good fortune out of it which I would not have made with normal trades with my current equipment.
Cool, thanks for the tips! My outbound leg was about 20 jumps, close to 130 LY from my start point, pretty much in a straight line...as much as a line one can have anyway. It was the return trip that turned into this bizarre Scenic Route, since I then only had a jump range of about 6.5LY.
However, if I put in Xihe in the search box from my start point, it does only say it is 67 LY away. I am now assuming this is a 'as the crow flies' straight shot measurment, which probably explains why I didn't see the Crazy Mad Money upon my return. I was hoping for a bit more than 500-1K per ton though, but oh well.
And yeah, ship upgrades are obviously needed. Hence, why I'm looking for teh Crazy Mad Money! But, as mentioned, I was doing 'fine' on my local mission runs, so I'll keep grinding those up till I get a Cobra, and then I'll take another look at these rare commod runs.
And, while I have dropped some higher ranked NPCs in larger ships in my Sidewinder and Cobra....the poor little Hauler with a basic burst laser is not a fighter! So, I'll just keep it weapons free, and throw a basic shield generator back on it for a little protection when I have to pull a Sir Robin again...