There are serious Legal reasons why that isn't done, as well as artistic reasons. I'm doing my own "movie" and I'm on my own because it's MINE. Not a derivative of ANYONE else's work, MINE.  As such, I use what fits my vision.  That makes my story, mine.  I can see fanart for all sort of movies in the galleries.

You'd have to get licenses cleared with the production company, and be appointed the only dealer of each mesh, etc.  In the end--that merchant would lose money. The license fees would eat up the profits, and at best, it'd be a break even proposition. 

In a nutshell, that's why it's not done that way,IMO.  Helgard,Jhoagland, and the other people at vanishingpoint could clue you in on some of the stumbling blocks a lot better than me.

I cannot save the world. Only my little piece of it. If we all act together, we can save the world.--Nelson Mandela
An  inconsistent hobgoblin is the fool of little minds
Taking "Just do it" to a whole new level!