Are tech stops staffed by your own people? I feel like the answer is no, but I've never tested it.
If they are...
- And you have multiple flights tech stop through the same airport, do you save money? Should you?
- Are they paid at the rate folks in your base airports are?
No, adding tech stops doesn't increase your staff at all. Since it's just for refueling, I guess the costs (landing fee, marshalling etc.) are included in the fuel price and borne by the fuel company.