Don't put your elevator pitch at the end of your blog posts, it makes me feel vaguely dirty upvoting them even when they're good.

In particular, don't present it as part of the content. A brief aside that the author is bla bla bla and they work on bla bla bla in a separate blurb below the end of the post is fine. When you put the pitch into the content so that the reader runs smack dab into it, it feels very dishonest.