How is that not defrauding the buyer?
It is conceivable that someone might think that No Starch Press books offer a quality premium that might justify a higher price. In the case where that higher quality is thought to occur in the contents, that's still not relevant. In the case where the higher quality comes from the better physical quality of the book, it is relevant, but that is a negligible part of the market for books of any type, even those that do come in collectible editions.
Consider an example: I own a copy of https://www.eastonpress.com/prod/EB8/2720043/Rudyard-Kipling... .
If someone were selling imitations of this that fell apart after a month or so, I would indeed consider that to be defrauding the buyer. Easton Press' entire reason for being is to sell existing books at a higher physical quality than you can normally get.
But Kipling's work is available in every form factor, from free ebooks at Project Gutenberg through cheap paperbacks to high-end collectibles. If Easton Press were the only party legally allowed to sell this book, I would no longer be willing to say that cheap imitations were defrauding the customer. I'd assume that people buying the cheaper versions were just trying to read the book. With only one vendor, there is no signal that the customer wanted physical quality, and overwhelmingly they don't, so there is no reason to assume that they do.