Actually John, it BEHOOVES those instructors to teach alternative aiming systems for "course marketability" reasons. As an instructor, you want your course to be packed to the gills with useful information, so that a student walks way with that "Wow!" feeling. If even ONE COMPONENT of that course rings bells with your student, there is a "for that one thing alone, it was money well spent" feeling on the part of the student.
"Pool school" is just that -- teaching anything and everything having to do with improving a student's pool game. It's not just stroke and fundamentals (although these *are* the foundation that everything else is built on -- a weak foundation is a weak pool game, no matter how strong the student can "aim").
It's not so much an endorsement of "this aiming system is important!" as it is making sure the course is chock full of well-rounded information, offering lots of components such that any student that walks through the door has at least something to latch onto, besides the core fundamentals.
I know when I do trade show presentations on information security, I pack it chock full of information from all sides of the fence -- white hat, black hat, and gray hat. Even though I know that some folks walking through the door may be die-hard hackers and phreakers (black hat), information security professionals (white hat), or information security consultants like myself (gray hat). The idea is that *anyone* that walks through my door, gets a chance to walk away with something completely new, besides the well-taught and well-worn information security basics.
I hope this helps,
-Sean
Helps? In what way? Presenting a seminar filled with the latest techniques is very different than having a hands-on course teaching them.
If I were giving a lecture on playing pool then I would mention the various aiming methods and perhaps my opinion of their value.
If I were teaching someone to play pool then I would certainly only teach them the best methods I know of which were commensurate with their ability at the time.
In this very small world of pool it can be the kiss of death to be a professional instructor who gets a bad rep for teaching bogus or confusing information. But beyond that there is also the professional ethics part of it in that no top level instructor is going to teach something that they know does not work.
I firmly believe that the top level instructors in pool who DO teach these methods teach them because they have examined them from every angle and found them to work well AND they have figured out how to teach them to students without confusing the students. To me this validates the methods much the same way as if some unknown hacker developed a new security protocol and you a well known security consultant were to adopt it. Your adoption is the validation I need to sign off on it for all my servers.
Hope this explains my position a little better.