I understand the general debate here. I am kind of stunned at how many people joined just to post and ask for a free manual and then never posted again.
A short while ago I went online searching for a manual, and found a member here that helped me source one. But when I found this forum, I started poking around and liked it, so I joined and I try to contribute. Simply wanting something for free doesn't mean it should be. If you find one for free, great! If you have to pay a bit, that would be okay (to me). I'm not trying to get a manual and sell the ideas to take profit from the mfr.
I think a mfr should offer all the manuals, and only charge for printed versions or the downloaded repair manuals. I think providing the owner/operator manuals for free electronically is smart just from the safety factor. Providing an electronic copy should reduce their overhead to nearly nothing too. This is all for current and recent models. If we're talking about tractors 20+ years old, then you get into the whole format issue, which would add cost to get it converted and readable. Once done, charge a nominal fee for doing so.
$30-50 is reasonable to me. $100 seems my personal limit, but would probably do it to have a version I could print as needed. Automobile manufacturers used to print and ship a repair manual (sometimes in 5 books) to the dealer for each model of car. Now the techs all access it online and the dealers recycled the manuals. Going PDF/electronic is also very green!
YMMV