Most of the blogs/sites allow or even require user registration, and once this happens: BANG! non-admin users have full look into Admin Panel where they can see all the set-ups, stats and earnings if the relevant plugins are installed. I know what one can say - if the admin can install google ad-sense plugin probably will pick-up another theme or will install plugin to sort out the problem but anyway...

Starter theme should:
- allow the admin to chose which elements of the Admin Panel remain visible to the users, or
- offer alternative theme for non-admins, which should/could be kept in the same aesthetic outlines and display the same logo as the site is using. This include the login screen.

Avoiding Wordpress logo flashing at 'registered-user-to-be' is very confusing as the person gets an impression of being redirected to some other service - especially those first time signing-up to WP based service.
Not mention active bloggers, writting for many WP build blogs who have to pay additional attention as 'all the sites look the same' in regards of the log-in screen.
Furthermore, site-wide use of site logo is fundamental for building proper and deep user-site relation.
Wordpress logo still can be used but rather in bottom line.

The theme delivering above functionalities could become a real hit. I definitely would use such theme.

P.D.