There is money to be made teaching CC.
There really isn't, if done correctly.
To start off with, you need to rent or secure a space. To my mind, that means a range with some plan to contain all that flying lead.
Then you need to hire some Range Safety Officers (NRA-Certified). One for every student on the firing line. So you can have 5 for a class of 15 students, but that means that you work in three relays, which takes time. Figure on $25 an hour for these people, at least. So for a class of 15 that charges $200/ea that gives each student 2 hours of range instruction, you're looking at $750 of your $3000 gross going to RSOs, one way or another. A scant one hour brings that down to $375, or more than 10% of gross.
Then there's materials. Targets, printouts/workbooks, your own demonstration firearms, snapcaps for everybody, etc etc. In a concealed carry class, you might also want to hire a local lawyer to explain the various foibles of local law.
Now you need to buy insurance. And your own continuing education.
You don't make a lot of money doing this. It's really hard to make it a full-time career. Most guys do it because they either genuinely enjoy it, or because they're tacticool commandos looking to show off. In my experience, it's all too often the latter.
Frankly, a CCW class taught by a gun shop
always rubs me the wrong way. For one thing, there's a bit of a conflict of interest--"Your J-frame .38 Spl is insufficient, you need a Blasticool 3950 AMX!"--and for another, doing the class right requires throwing good business strategy right out the window. Not all shop owners are like that, but I can think of one shop in my area that offers "training" like that.
I have seen places that take everybody. Some folks are not teachable, and a risk to the class and themselves. This lack of aptitude, if not immediately obvious, will be, before live range time.
To make matters worse some are passed, and out there with loaded firearms.
100% agree. Although I hesitate to ever say somebody "passed".