True. Producing a demo is serious and expensive business that the general gamer isn't aware of. In many cases, it can be akin to producing a separate game. That's why I wince when I hear people complain about Kickstarter projects and general indie games not having them. Just tells me the industry hasn't done much to educate gamers on how these things work.
That said, it seems like demos at the AAA level are getting lean this generation, and I don't like it one bit. Overall, it seems like EA/Tiburon is trimming the fat from their marketing and at the same time trying to avoid over-saturation. We'll see how that works sales-wise this year.