There are 25 parked @ MacDonald Settlement, not sure if they are hogging all the slots or not. But it seems from the names that all 25 are owned carriers, so a glut in one carrier purchase system may inhibit the sales. Only the devs could answer that ? and they are snoozing.There are over 20 carriers in my system and I can't get one.
However, I earned about 20M short-hauling Tritium, there's a 26k buy/sell price differential among systems within one jump of a fairly well-engineered ship having decent cargo capacity. I'd have doubled that at least if the best Buy wasn't at an outpost, I had to use my Python (156T) instead of my Corvette (384T).
Black Adder still haunts my FC dreams, however, the bahstahd!