I'll preface this with the fact that I completely agree with your sentiment.
> it's still not even a physical book (so why so expensive?)
I have never written or published a book, but my understanding is that the cost of writing the book far outweighs the cost of actually printing it. Human time and knowledge is way more costly than some paper and the effort of a machine that spits out books by the second.
> If you pay $289 (which is an absolute absurd price for any book)
This offer and especially the in-person one seem like they are targeting businesses. A lot of places will pay orders of magnitude more to have someone work directly with their employees.
Honestly, about $93/hour is on the cheap side for in-person training. (I'm not saying it's good training or even close to worth it, just what the landscape looks like)
Edit: actually, it would be cheaper than $93/hour since I'm not taking the other things into account. Let's say the book and all the other stuff realistically make up about $150 of the price (I am guessing the $289 is just trying to get you to buy one of the surrounding tiers). That's actually $75/hour for the training.