You seem to be basing your impression on Comp. results.. while that is a hallmark, its not the be all and end all of dance .
I,m not defending un qualified " teachers ?" , but.. a certif. does NOT guarantee anything ! ( and yes, I,m highly Qualif. ), more importantly, is the ability to help people to get back into a social life, dance is the tool we provide .
If I depended on medal test and Comp. students, I would be out of work !.
And yes, we( qualif ones ) do have a code of ethics, and they are enforced for major infractions .BUT ,, one cannot regulate "bad " teaching .
Remember.. water always finds its own level.