To win sales, you must gain user trust. This means that you should not be afraid to share your knowledge. SEO focused Meta tags are great ways to establish search engine identity, but sales and product promotion can never stop there. Some buyers start out as window shoppers. These are not your preferred browsers. Unless something on your site just happens to catch and hold their attention, the window shoppers may never return.
Others come as information seekers. These are the ones that were drawn by your SEO focused inbound links and your fine tuned SEO injected page content. They come looking for specific information, and they expect honesty.