In Reply to: "Non native speakers posted by Snoopy on Tuesday, 25. September 2012 at 04:39 Bali Time:
Indonesia is not a prerequisite for teaching English in Indonesian language schools or courses.
In many cases native speaker teachers are stricly instructed not to speak in any other language than English during English language classes.
Sherbert's point below is accurate.
Did you ever see the British sit com - Mind Your Language?