I've heard preachers that were preaching from the gospels who will skip over the "Christmas account" since they preach that for Christmas.
Would it really hurt to hear such preaching more than once a year? Wouldn't it perhaps be nice to hear that preached upon outside the context of it being preached just because it's the Christmas season?
If I am preaching a series, I will sometimes take a break from the series for a special time - church anniversary Sunday, or missions month, or something like that, but I would never miss a section of a book I was preaching through for any reason.
And what you mention there John just seems unbelievable - except that I can believe it with some preachers I have known and heard of....