Yes, the ignorance is of how a business is run. Consider for a moment the marketing and sales decisions involved here. In order to translate properly a technical work the vendor must engage translators versed in the alternate language and in the technical field as well. They must also reprint the volume as well. That kind of thing doesn't come cheap. What would be the vendor's return on that investment? Whereas a book seller of English language volumes has a massive base of readers to sell to so as a business decision most of those volumes don't get translated either. Risk vs reward is the guiding principle. The maker of the cruiser book has simply judged that the cost of translating and reprinting the volume in question is simply too much to risk the cost of doing so. Come on guys, how many books are they going to sell on this subject?