However, I do not expect John Deere to change their policy on this matter. This is a poor way to treat customers.
You don't have any idea how much it costs to create a technical manual.
In 1971, I worked for a company that did the technical manuals for Fuller transmissions. At that time, the cost to do a manual for a single transmission model was $15,000. Most of that was in drafting time, and layout of the manual. I'd guess that today, for an entire tractor, the cost to produce a service manual is at least $70,000 to $100,000 - if not more. While computer aided drafting helps speed up the drafting process and computerized layout software like Quark, InDesign, Pagemaker, etc. make digital compositing of the publication much faster - there's still thousands of hours that go into making up the manual.
$410 sounds cheap to me for an extremely low sales publication that was very expensive to produce. It's not exactly like it's going to sell a million copies and spend 44 weeks at the top of the NY Times' Best Seller list.