[ezy]

One would like to think licensing is about ensuring quality, but if one actually takes a look at the reality, one realizes that licensing is about restricting the field and paying to play, and almost never about ensuring quality.

Even professional licenses are like this, unless you are a complete idiot it's not the knowledge that's the problem (e.g. passing the exam, if there is one), it's paying for the requirements (e.g. the degree and/or the continuing license fee) or fitting the requirements (e.g. being a foreign worker).