IMO you'd get a better reaction if you put a large chunk of your Plugins page on your main page. The "plugins" page better illustrates the purpose and vision of OJJS. The example on the main page is so low level it turns people off.
That being said, I still think the bulk of the "markup" should be in markup and reside as a template for your "plugin" or component to use.
So you have an EmailView component but with an EmailView template file as well. The EmailView is instantiated and manipulated in Javascript but it still has the benefits of markup via its template file.
Concrete example: Template: https://github.com/tantaman/Strut/blob/master/app/bundles/ap... Component: https://github.com/tantaman/Strut/blob/master/app/bundles/ap...