Why salt mines?

Good question. We have an unusual craving for salt. We're kind of anti-slugs. Our own world has very little salt. Maybe that's related. I'm not a biologist, and I don't care to ask one. (They're very smug.) Whatever the reason, wherever we encounter a world rich in salt, we set up a mine, and then we send in slaves, like you.

Staycations

We have no vacations. We have a different concept of liesure. I, for instance, enjoy interrogation, so when I need time off I take over for the interrogators, who hate their job. They then may go to the mines to whip slaves, or come to Earth to fill in for vacationing bureaucrats like myself. It's all diversion. Anything different than what we do all the time is a change. It's mental stimulus. That's all that counts. Your own obsessive need to escape will ill suit your future.

The next question on your minds

I know what you're thinking without you having to ask this one: Will we take any humans as sex slaves? Some are considering it -- after all, every species has members who get kinky -- but I'd have to say there won't be many. The proportions are way off; you'd have to use an entire arm, a foot and a knee. Plus, we'd have to shave parts of you and add hair to other parts. I just don't see it.