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I believe the main reason is that a number of schools prefer to hire domestic professors. I went to a top 20 b-school for my bachelor and there were only a handful of foreign professors. The reason was that students don't want to take classes from professors that they can not understand.
For example, there were two professors for micro. One was from Taiwan and the other an American. People would put the class off a semester just to make sure they got the American professor. It was due to the difficulty understanding the accent and due to the different teaching style from the different cultures.
This is just my opinion from personal experience. I could be totally off. It wouldn't be the first time.
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