That's really interesting, thanks for sharing. I despise these long sales pages but people keep telling me that they work. I just can't figure out why. Perhaps they work for stupid people so you get a chance to hammer the message into their thick heads.
As for webinars - they have me running for the hills. A lot of videos are awful too. A pet hate of mine is when someone wants to force you to spend an hour listening to them waffle on. It's so much better when they provide a transcript (which I think you do, but I've not had a chance to see much of your course yet). When you get a transcript, at least you can scan read it and pause at the more interesting bits.
But just like these long sales pages, videos often seem to be more popular than text. I wonder if it depends on the demographic. If "one" is targeting stupid people then give them a long page and a waffly video.