Honestly, the biggest issue that I can see is that the NC interactive model requires setting up the book as an "app". At least, that's how it seems to me with the "cookbook" that was pushed with the update -- it's a book, but it's in the store as an "app" and you can't download the text content separately to your computer in, say, epub format. At least, not that I can see.
eReaders come and go. I don't want to pay for a book that will only work on one eReader and that can't be backed up to my computer, at LEAST in "text" format. There may be some people who will pay for an interactive book and not worry about it existing 2 years down the line, but I think a lot of us have done enough "repurchasing" of books to last us a life time.
However, if the tech came around to support computer backup and a standard format that would play on other readers, I'd buy something like that.
CYOA stuff is tricky to write, though.