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It's probably due to the pronunciation being basically the same in spoken English. I'd wager that many of the people who use "then" rather than "than" aren't mixing them up, so much as not having any recognition that "than" exists.
A more valid peeve (because, really, the then/than convention is pretty useless) would be the use of "that" v. "who".
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Simple Machines in Higher Dimensions
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