Frank the reason is that programmers thought that no one would want to watch black and white episodes. And it's possible that the color episodes outrated the B&W episodes. But, really they were cutting their nose off to spite their face. With the black and white episodes you have 98 Gilligan's Island in the package. Without them, you only have 62. It had to have hurt the ratings in the long run to be repeating episodes so often.
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