I attended the Nikon School about 15 years ago, and at that time, the price was $99 or so. It ran for the day (can't remember the time for sure but something like 9am-4pm). I knew quite a bit of what they taught, but based on the number of questions asked, many of the attendees weren't too knowledgeable about photography.
It was so long ago that I honestly can't remember too much about it, but they DID show an incredible number of AWESOME photos--they used a projector. They would talk about each photo and explore why the photo was good--composition, aperture, shutter speed, ISO, film type, etc. This was back when 35mm and slides were still the methods used. I believe the workshop was run by 2 guys, and they brought their own photos to show. They weren't given generic photos that Nikon provided.
I have no idea how the workshops are run now, but I really enjoyed it and felt it was worthwhile.