I agree about the announcement being a good place to put terms for search engines (at least that's what I've heard) and so our announcement begins with a list of the types of items we sell. There's really nothing in the announcement about "us" - I put that stuff in the profile. I did add links in the announcement area to the former shop (changed shop names), facebook, twitter, blog, etc. It's a fairly short announcement but unfortunately there's still the need to click the read more button.
Our profile is much longer. I'm sure not everyone would read one that long, but since this shop is run by two people (me and my husband) we wanted to mention something about each of us. I also wanted to include something about what led to making the things we offer in the shop. I made some changes to the profile a few weeks ago and I'm sure I'll rewrite it again at some point. I doubt I'll make it really short, though.