Yes, Slobodan's right; anyone can teach photographic technique in the sense of the mechanics, but being a photographer takes something else.
Beyond simple, mechanical abilty and/or creative ability, it takes a commitment that few are able to make (I'm speaking pro) or dedicated enough to make, if only because when you have it, you aren't thinking about the odds stacked way over your head against you surviving even the first year out in the big bad world, you just friggin' have no option: you are compelled by your own nature to find the work to feed the habit, and habit it damned sure is.
Teaching. I neither have nor offer any downer on professional teachers. My own daughter and her husband are teachers (and I've even had Teachers Whisky as clients), but where I do find a problem is with photographers who fail to make it as such and take up peddling photography lessons yet insist that they are still bona fide professionals. They are neither pro snappers nor pro teachers, in my view; at best, they strike me as lukewarm, probably very well-intentioned, but neither fish nor fowl.
Part of my family is here with me just now, spending a couple of weeks in the sunshine (we hope) and tonight I took them along to a gig where my muso mates were playing. Now there's another form of pure dedication: you could catch the tiredness in the eyes at some moments, and yet seconds later, as some little bit of improvisation worked out well, the cheer was instantly back in the faces. Think of doing this at every gig you can find, and they are few and far between in this economy now, and you realise just what bloody hard work it is being creative in a bar or restaurant. Yet, they want nothing else. And there, again, the 'teaching' sometimes comes into play if only to make ends meet. Talent ain't always enough...
Hell, we do what we can do, and some do it better than others and get nowhere whilst others just seem to get everywhere on thin air.
It takes a little madness.