Are native speakers worth the money they want for their “native knowledge”?

 The fashion for native speakers has become so widespread that even regular schools are hiring Americans or English speakers, not to mention expensive language courses or prestigious universities. Today every self-respecting organization must have a native speaker on staff, because they are considered to be better experts. I've got mixed feelings about this, is this fair?

 Imagine that your dumbest classmate goes to Australia to teach Russian. You remember him making five mistakes in a three-letter word, but who in Australia can check his language skills? You are spot on, nobody. Just because he was born and brought up in Russia makes him a native speaker, but that does not mean he has enough knowledge and skills to teach the language.

 It's true that people usually “feel” their native language and can work with it intuitively, but we may not know all the rules, nor can we explain it. But when we talk about teaching we should be one hundred percent sure that we are right.

 I also know that many African Americans come to Russia to teach English. By the way, I work with such guys :)

But English in Africa is very different from the English that is spoken at Buckingham Palace, so I think it's better to hire an educated Russian tutor who can be head and shoulders above than a native speaker of some strange dialect.