I personally don't see anything wrong with it. I've read it and it's quite interesting and helpful. I don't think $9.00 is a bad price at all for all the work it takes to put these together, it's not like they just copied and pasted someone else's work into a PDF.
Someone had to take the time to research the 2 languages, learn them, write it all up, get all the screenshot images and put it together nicely, create a nice table of contents, create all the anchor links to work correctly, and I'm betting they had to get paid as an employee to do so which means the company had to pay to have it created.
Why in the world would you expect it to be free or for less money? You're very free to go spend the 30 to 60 bux for the hard cover books, I myself intend to do just that even though I have this CC one as there will be a lot to be learned as it's all published. But, why so much aggravation about this? All companies create things to sell, that's the whole idea behind them being in business, so what's the issue on this really?
I have it, I printed it out and now have a hard copy and a virtual copy that I can read on my computer or on my iPod which I just put it on. All that for $9.00 is pretty good.
I can for sure tell you that if you want a normal hard copy book you're going to spend 30 to 60 bux for it, AND if you want a PDF copy you'll spend ANOTHER 20 bux or more for it (many charge 29.99) so for $9.00 you have a primer to a very cool new system, and not just 1 system, but 2! HTML5 "and" CSS3 which I think is quite a bargain for the price!