It's nice finding a seemingly 'forgotten' effect in an older book or digging up something amazing at a secondhand book store. However, new books are different. They still bring royalties to the authors rather than the publishers. I'd be a nice if new magic books sold well enough to be financially worthwhile for people to write (but not well enough to result in a flood of awful books).
However, if a person is going to like a video review more than a text review, are they really going to be the type to prefer to spend money on a book rather than a DVD? Trying to appeal to the wrong market there I think. I like print as opposed to video - you can read it anywhere, you can skim it, and skipping to the right place is easier. For the same reasons I prefer text reviews - they don't take as much time to get through and load faster. However, mot people are not as extremely text-loving as I am. If you have little or nothing to lose, I'd try it. Don't wait for the approval of strangers on the internet, y'know what I'm sayin'?