I've had two or three seatbelt violations on drivecam. And when I've seen it in told the coacb, "that's such and such place, that's their private driveway" and they have said, "oh, ok, I'll get that one removed."
If you're coach isn't doing that, he's wrong.
I also had one for not being belted on a roadway, a road i was backing into a residential dirt driveway. I said, "I have it off to hang out the window like you see me there. I took it off as I put it in reverse for a better view." That one was also removed.
Also had a couple I deserved.
This isn't a problem with the system, it sounds like a problem with the coaches.