So i did a good amount of missions. Tracked the cost, time, and rewards of the missions.
https://docs.google.com/spreadsheet/ccc?key=0AjgUhw-_xsXkdFlJNVhlckl4OGtfTXg2Y2ZKbnUySGc
As you can see from the spreadsheet, i earned 10k creds off of 57k spent. But, if you look at the total companion time going out to do the missions, not worth it. It also seems like i am not getting as many missions any more.
So, from what i found, its not a negative loss on slicing. Just more of a waste of time for me.