But the missions associated with the station offering the CGs turn out to be profitable as rep increases when you ship stuff in or hand in bounties. I usually make more credits from those than the CG, so I view the CG credits as an extra bonus at the end.
One can go to ROBIGO and make a billion cr's in 12 to 14 hours or get enough INF for the federal to make it from zero to Lt. Commander in the same amount of time.