I hire as long as they're not in SFW or System War. Or if they're Cows in a Pwar. If they're building tb, I still hire. If they're in pwar (hitting), I hire. Etc. I remember this 500kcs chick had a status along the lines of "Dont Hire My Tutors Or I'll Show You What I Can Do". So I hired two of her 2b tutors (decent stats for the price) and she walled me a few hrs later saying "Please don't hire my tutors" and hired em back. I guess what she showed me was that she doesn't farm over tuts.
I wish a lot of people know this. I was warned many times on my wall over hiring a tutor. It's not like I'm going to look for someone's status message before hiring him/her.
Well hopefully your pupil will back you up if you have an issue. TFT boss. If you don't want your tuts hired overprice them. If you can't do that don't hire any tuts this is a game of competition. Tut market is free market unless in war