The reason one would use a collector for I would assume would be the same reason I use a spatial for missions. You can carry all the random loot that the NPCs drop without having to choose niobium over silver or something. I have seen the difference such a cargo hold makes. I can make approximately 27 % more on a mission.
Used to be that I would be hard pressed to make 2 mill in an hour, but now my record for cash/hour ratio is 3.5 million per hour.
Wow I need better guns then because I can't kill my target when I take an assassinate mission worth even $90,000.:D
"To gain a hundred victories in a hundred battles is not the highest excellence;
to subjugate the enemy's army without doing battle is the highest of excellence."