Of course they would. They'd make a profit, too.
Who is being disingenuous here? Why would they make a profit when anyone who does a quick google for what they're selling would find it for half price or even less from someone else? Other people can sell for those prices because they didn't have the production costs -- it costs almost nothing to dupe a DVD, but it costs a lot of money to produce a good quality movie. Nobody who is smart enough to have a couple of million dollars to spend on producing a movie would be dumb enough to accept the nonsense that he'll make anything back on it if anyone who wants to can copy and distribute it for him for free. That's why it isn't a standard model for movie production, not any "copyright cartel" stopping him.
It's not about prevention. It's about not being able to compete with someone who is successfully gaming the system.
What competition? If you can make a quality movie under CC licensing, then what competition is there? Oh, yes, the competition from people who will copy your movie and sell it for you, keeping the profit instead of giving it back to you. But there's no competition from the "copyright cartel". They can't stop you from making your movie or distributing it. So what if they make other movies that compete for eyeballs with yours? You've made the movie, you're distributing it. It doesn't matter if they are CC or analy-restrictive licensed -- under either licensing scheme their movies will compete for sales with yours, so how it is licensed doesn't matter.
It's odd that you think that you as a producer of a CC movie would have competition enough to stop you from other movie producers, but that you wouldn't have significant direct and immediate competition from other people selling your movie for you. That's just, well, weird. We live in a world of Chinese knock-offs causing significant damage to US technology firms and yet you think allowing everyone to knock-off a major motion picture would not harm the original investors at all.