I know what marketing is. I have worked in the record industry and created marketing campaigns.
Ok, then you should realize that nobody sat there at the DVD company and said “we don’t want to show black people or women on this DVD cover”, so why would you blame racism and sexism?
Here’s a similar example. If you go look for the old Roger Korman version of “Little Shop of Horrors” on DVD, every version will say “Starring Jack Nicholson”, with a big picture of him on the cover, even though he only has a bit part in the film. He’s just the only selling point to the film, so that is what the marketing is designed around.