Nice one jportzer.
The guy I worked with was a chinese national. He was here on a 457 for 3 years, as that was the time his company in China would permit him to be away and still have a job to return to. The officials at the time were visiting him roughly every 3 months. I doubt very much that he was working in the industry he entered the country on the 457 for, but that didn't seem to matter to them.