While I agree it's scummy for Paramount to do this, it is something that happens with movies and music when released through retailers. One will have a book, another will have a few extra songs not available anywhere else, etc.
I'm keeping my preorder with Best Buy, because I want the movie itself. I've maybe only really looked at special features once on a movie and that's about it. Some I'll look at a few times if it's a documentary or something, but making of stuff I'll only look through once and not watch them again after that.