This is my scavenging income if I put literally everyone on scavenging with most of them trained to at least 60 int.
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So it does make a difference.
Some mercs are MUCH more useful as accountants or whores though, and Ayden gives you a penalty if you make him anything other than a guard or a captain. So with Ayden as a captain, Dexter, Aiko, Armand, and Adrianne as accountants, Loren and Enya as whores, and everyone else as scavengers my scavenging income drops to a more reasonable 68 with my accountants bringing in $544 a day and my whores bringing in $75 a day (have not boosted their corruption enough for the bonus).
I did not train int on Space Marine, Loren, or Enya. Everyone else has 60 or 70.
Oh I also get 5 guard power from a domesticated wrool cat
I tried training them by making them students but I have never had any luck with that. I train them all manually. If you get MC's int up to 100 or so you get mostly successes on everyone except Rifle Savant so you can train 2 points a day on most mercs if you do it yourself. That does take months but it's WAY faster than making them students.