In reply to Sybre Waaijer.

Thanks to the Tavern for enabling this discussion, and for such a constructive post.
Please, "Add a standardized and exposed “has premium” button on the plugin/theme page".
This is such a common sense thing to do which can only improve things, and will enhance the aims of the WP Notify project.
There is always a more "acceptable way" to do things.
I am fine with commercial themes and plugins supporting, improving and building on open source, people have to make a living. However I get sick of pollution in the admin area.
I just delete those who pollute, but that is not the solution for providing a more acceptable way of doing things. I also know how to move plugins such as Jetpack to the bottom of the Admin menu, but most users will not.

Getting something done in this area will be a great enhancement to WordPress.