We don't publish the content of the HTML snippet widget straight into the HTML for a good reason. The snippet of code could contain badly written/malicious JavaScript or HTML which if loaded inline with the page HTML would break the site completely. At the moment the snippet is safely 'sandboxed' from the rest of the site by being loaded in the iFrame.

This naturally does impact SEO as search engine bots won't follow the 'src=/cgi-bin/snippet.cgi' to the snippet contents. This is not something that can or will be changed.