I'm a reader who follows an author, not necessarily a genre, so I get pretty irritated when authors do that. Hence, I don't and won't do it. Plus, I don't like people assuming I'm dumb, and I'd like to extend the same courtesy to my readers. They can just be bloody well confused, if they can't read the description and tags well enough to pick the genre of the book.
Then again, people offended by genre-switching will probably get too offended to read more than one of my books anyhow.
