A number of clubs regrettably are paranoid.
Some require that you provide the club with a huge insurance policy coverage which can make training not financially feasible even for those trying to make money at it.
Others will only allow some of their hand-picked buddies to use the facilities to do training.
Luckily there are a few clubs that allow members to train guests.
Very few will allow outside group use or formal training classes like NEShooters.com runs.
I'm the range chairman at my club. Our pistol range isn't much (yet), but it's normally a safe place to shoot. We have no full or even part-time range officers.
As far as requiring an instructor to ask permission, I don't see the problem. Think about it; and put yourself in the Club's place. When you think of an instructor and his/her students, instead of picturing Jim Conway with a small group of responsible adults (which would be a situation acceptable to any reasonable club); think of this:
A blow-hard, opinionated, "just-got-my-instructor-certification", tactical leg holster wearing, I-know-everything "instructor" shows up with 40 or so baggy pants-wearing gangbanger wannabe "students". On the way to the range, they speed down the access road in their fart can mufflered powered subwoofers, pissing off all of the Club's neighbors (and putting these neighbors on alert). The safety violations start as soon as the guns are out of the cases. When they're done, the range is left looking like a tornado hit it, with broken target stands, and piles of trash and brass all over the place. The neighbors will place enough noise complaint calls to the local police to cause the chief to show up at our next club meeting.
How do you prevent this from happening? Easy. Require a vetting process that we'll call "asking permission". All we're trying to do is to prevent the above scenario from happening if we can.
Sure, we'll let our "hand picked buddies" do it. By "hand picked" I mean responsible instructors that ask permission. If an instructor wanted to do it, all he or she would have to do is to show up at one of our meetings with a course outline, describe what they were going to do, and ask permission. It would also help if the instructor had a member or two vouch for them. This would have to happen only the first time. If the class goes well, permission would be "rubber-stamped" unless/until there was a problem.
Any member can bring a couple of people to the range for instruction. I do it all the time, and most of the other members do it too. But if a member plans on taking, say, 12 people to the range and conducting a "class", the right thing to do would be to ask permission - especially if they were getting paid for it.