This seems to be the way that commercial Wordpress themes are sold. 100% GPL licensed, but sold in the normal way. eg http://crowdfavorite.com/carrington-build/

This seems to be the way that commercial Wordpress themes are sold. 100% GPL licensed, but sold in the normal way. eg http://crowdfavorite.com/carrington-build/docs/faq/#license http://crowdfavorite.com/carrington-build/docs/faq/#license. It seems to be working.