From the little information I have Hampton Roads is not necessarily the best publisher, and surely not very big either. The resources required for proofreading are limited for most small publishers, which most esoteric publishers are, and additionally proofreading is one of the things publishers can squeeze a bit to reduce cost - dumping more books on less proofreaders, knowing that the impact on quality is usually only mild and overlooked by most readers.

Robert's writing style is lucid, understandable, and he has an excellent command of the balance between explaining too little and going on and on about something. His writing is just good. I enjoyed all his books, both for writing style and content.

Complaining about a single typo is just and simply way over the top.

Oliver