That is an option. Whose to say the follow-on product will be tagged identically as premium? Either I am an idiot or there is some item not identified to me as a "pro" feature that I have included. Sure, it could be some oversight on my part, but there should be a clear delineation between free and premium that is obvious to the person designing and publishing the product. Facer could add a streamer in the developer and publisher screens advising the "status" of the design as free or premium. If nothing else, a popup disclaimer saying this product requires a premium account to use, are you sure you want to proceed? It can also specify which elements may be driving it to be premium.
Edit:/ I made the suggestion to create what I call a Seller Status Streamer. http://community.facer.io/t/seller-status-streamer/40118