Ask questions, meet dancers, and be part of the conversation.
I charge them the base fee for a private lesson, then tack on extra (depends on where I'm at) to compensate for the extra people. It's their responsibility to divide the cost between them, and I'll divide my time between them.
Because with two (or four, or six) extra people, it's no longer a private lesson between one person or one partnership and the teacher with that whole time-frame (an hour and change) to work in. A normal group class is either walk-in or sign-up friendly to anyone. The time is spent introducing material, covering the basics of it, allowing them to practice it while adding some general pointers/pointing out common issues, and moving on with nominal individual assistance (we have more time in some of our classes, so we do walk around and offer help when needed during the practice-with-music time). If it's specifically a "private" or "semi-private" lesson, then it's my responsibility to make sure the focus gets distributed as evenly as I can manage given the time-frame and the number of people involved. Group classes don't have the same kind of 'personal assistance' level, especially when there are anywhere from twenty to sixty people involved. Also, I added "depending where I'm at" because of my time and expense involved depending on where I travel and pay a fee to teach.
Your experience wasn't a good one, but it was a too-typical one: He invited your wife to your lesson with the specific intent to charge you more for her time, and then tried to hook her interest so that he'd get more money. If he spent all his time teaching her, she could feel like she's accomplishing something and be more motivated to return. You were already there, so you were, to his mind (and incorrectly assuming) that you were a safe bet to stay. Did your wife stick around with this instructor, or is she still taking lessons with another?
Neither of us stayed. I had 3 lessons paid for, so we did two together and that covered the value of the 3 lessons. The whole thing rubbed me the wrong way, he didn't tell me he was charging more until the two lessons were over and he said, "well, that covers what you had paid for, would you like to purchase another package now or next time you come in." I said next time and never returned. Really just didn't have the heart to be confrontational and I have no doubt he knows why we didn't return. Out of those 3 hours paid for, I got about 35 minutes, my wife got about 60 and the last 25 minutes spent dancing together. If we would have gone in separately, she could have gotten her hour and I could have gotten two.
exactly...because, if he/she doesn't even have to dance with you because you have a partner, that is likely LESS work....and I would be suspicious also that the person was actually discouraging couples because they prefer a competitive single...now, I do know some pro's who distinguish between a lesson fee and a coaching fee....and that could look like a greater charge to some than others but I can see valid reasons for thatIt's not a "semi private" if it was just two people, i.e. a partnership. It's VERY unusual to charge more for a partnership vs. one person, at least IME. A semi-private usually refers to ~2 couples.
You were right not to go back... yeah, an instructor can change what they want, there's nothing wrong with it, but that's definitely overcharging, and unscrupulous if he didn't tell you beforehand. Plus - and yes, this is speculation - it tells me he probably isn't used to teaching couples, which makes me question his skill level.
I think the question to be asked is "what chain studio did you have this experience in"...
Not a fair assumption--the chain studio that I dance at would not do that. This could, of course, have happened at a chain, but in my experience the assumption is unwarranted.