While the entry model analogy with cars is fair I don't like the idea of the concept creeping into consoles. "oh, you need the more expensive version to play this popular game" - isn't something I ever wanted to experience with videogames. Really, this gen has seen a lot of stuff that from a consumer perspective I dislike, such as overpriced DLC and some ridiculous timed exclusives and content.
Still, I also doubt it's any kind of conspiracy on MS - clearly for some engine related reason that mode needs more cache than the 4GB can allocate, which is a pity but I doubt something deliberately coded for.
Thankfully this only happens to a few titles, pity one of them is the platforms Marquee title.
EDIT: edit - given it's just one, less popular mode it's not huge either, just unwlecome in this particular title.
Try to be reasonable... its easier than you think...
