But what exactly did you expect from those books? Step-by-step screenshots for every SD scenario imaginable?
I bought "Enhancing the Quality of ABAP Development" back in 2005 and also Paul Hardy's "ABAP to the Future". Both books are worth their weight in gold IMHO. The SAP Press books are more expensive than an average book because they are "niche" products (it's not possible to sell as many SAP books as some fiction novels). Compared to the SAP professional's salary in the developed countries these books are quite affordable (they are also cheaper on Amazon). And in the US they can be easily returned to the seller if they didn't provide the expected satisfaction.
Of course, I could never afford those books back in my former home country where they would be the equivalent of 20% my monthly salary. I can totally empathize with you on that part, but surely you must understand this is not the publisher's or author's fault that there is such income inequality. (As a side note - I do feel though that publishers might want to think about it and come up with some solution to make these books more affordable in certain countries. Otherwise the books copies are just getting distributed illegally.)
Since I became an author myself recently (shameless self-promotion), I feel these books are actually dirt cheap. I've been always complaining that tomatoes get more expensive every year at a local farmers market. Then we started growing our own in the backyard. And now I think the tomatoes should cost about $50. Each! 
I'm a bit confused why you seem to feel that the book also entitles the buyer to unlimited free consulting from the author (if I understood you correctly). Most likely it was not what the authors had in mind when they posted their emails.
And I'm confused by your expertise level as well - at first you stated that you're learning SD but then you seem to feel qualified to identify some errors in the books. If you already know that much I'm confused (yet again) why you chose to purchase the books...