I thought that the reason that most movies were made today was because of the marketing for toys/games/comic books/tv spinoffs/etc. Then again the term "moviemercial" reminds me of the 5 mins (?) of commercials that I see before the previews at any movie that I see in a movie theatre.
Besides that, all movies are great marketing tie-ins with the DVD.
Either way I don't mind the merchandising and stuff as long as the movie is good (rare) and they don't beat you senseless with the product tie-ins (very rare).