Buddy has some good points.
As for the book itself, Does anyone know where it was originally printed over 10 years ago when it first came out?
Great as the book is, I'm sure it never came close to being a big money maker for the published. It's all about the bottom line, and if they are not making money (which is the sole purpose of a business) they will outsource when it suits them.
Outsourcing doesn't means overseas, just letting another company do the work for them. If they can't do something economically, chances are another American company cannot either.
I've dealt with printing companies through work many times and the more you order of an a printed item the cheaper the price, because there are set setup costs for a single printing run whether it be 100 or 100,000. The setup cost are divided among each piece produced. For a printed product you plan to sell (as opposed to printed consumables for a business) the more you order the more you can spread out these cost per product. Smaller production run just cost more. So for the author to get a decent percent of each book sold HE will agree to the most economical production.