Pilot NPC aren't worth much until combat kicks in. Then they may augment your overall squadron/fighter abilities.
As far as income goes, I don't know except that you can hire and sell NPC's. With your level of diplomacy you should get a good discount...
And at least builder NPC's work for you when you want to build a city or something.
I hope this helps a bit.
"Can sing, can dance, can handle a vibroblade a little..."