This is a source of constant debate in the TEFL world. Here in Spain, many Spaniards (employers and students) request native speaker teachers. They hold beliefs, or prejudices, such as:
British speak proper English not like Americans
My German / Dutch /Spanish teacher of English knows grammar but speaks with a terrible accent
I want to speak proper English like my British / American/ Australian / teacher
This is a complex and controversial topic…
I found this interesting article about non-native speaker teachers. I you want to read more just click on the link below. You can also add your comment.