Time and effort are other factors. Each release, especially when done correctly, requires a great deal of time and manpower. Tracking down the best possible source material, restoring and remastering it, and securing the musical rights can take years. For a studio like Warners, that owns the rights to the two DS movies, this is especially significant because they own the entire catalogs of Warner Brothers and MGM and must allocate time very carefully. Among those films are the works of Bette Davis, Joan Crawford, Greta Garbo, and nearly every other star of the Golden Age of Hollywood. Understandably, these films take precedence over the DS films, which really aren't all that significant in the grand scheme of things.
