Jeffery, the fact that one is a native speak doesn't in any way qualify he or she to teach English.Don't forget that English is a subject just like any other subject.Why is English taught as a subject in schools in native English speaking countries? Can any Australian teach English in the UK? Of course no.According to The Education Crisis report;
60% of all American youth have dropped out of school or scraped by to graduate with barely a 7th-grade education. Where are they? A good number are teaching English in Asia. Yes, their oral English is great,but can they pass the information to the kids? This remain questionable because some dont even know the word "pedagagy". Only Chinese employers or schools know who is the right person to teach depending on the response of their cutomers who unfortunately are innocent parents.It's a "catch 22 situation"