[ZeroGravitas]

You could say the exact same about any "open" project. Open Access journals, open textbooks, Wikipedia, open source software. All redirect money from the people who are getting it now, all have been accused of being lower quality (most loudly by those in the previously getting money faction), all are dismissed as only being of interest to those who want something for nothing.

So lets look at the other side e.g. schools can easily download these works. It's not just the initial purchase money, though that would be enough for many poorer schools to simply not bother, it's dealing with physical CDs, or DRM'd downloads or accounting for licences when the licence holders group comes knocking, giving copies to the kids to use at home or on their iPods, letting them score an animated movie or documentary they are making. Once things are "free" options open up that are difficult to imagine when there is a fee, no matter how small.