The price for private lessons is very likely influenced by your geographic region as well. Where one location can easily support private lessons of $100 an hour, other locals simply can't afford that sort of price. Also, I'll change my personal rates based on how much I enjoy working with the client or group. My base is $100 an hour, but I'll drop to $50, $40, or even free if I really enjoy the person I'm working with.
If it doesn't feel like work, I don't mind treating it as such. Note though that I make money as both a school teacher and as an owner of a good deal of real estate, so I have the luxury of being able to discount my "extra" time. The gym is profitable, but doesn't need to be in order for me to feed my family.
Also, a possible suggestion for this thread:
List the coaches who have checked in and shared their resume/accolades/experiences in the first post of the thread. It would be nice for anyone checking in to see where current coaches work and what their experience level is. Just a short standard format blurb that coaches could fill out. Even further, I would love to know which coaches have had a financial stake in the business (owner or manager) aside from just their own profits.
As the thread gets longer, I see can only assume "casual" coaches, or worse, those with no experience in a coaching role at all will be more comfortable being vocal.
I would love to see this as a resource from coaches for coaches, but would hate to see it watered down by casual fight observers. Though I can appreciate that people who have never been directly involved in the sport can have an eye for things at some level, I wouldn't want to take electrical advice from my plumber if you know what I'm saying.
Not sure if that's unfair, but just my 2 cents.