The extra paying is what annoys you 100%? How about that, you want the manual you pay the normal price, those who dont want it get a discount.
My friend, when you buy something nothing is for free inside it, not the manual of your TV, not the box, not the plastic bag insides it, its storage in a warehouse, transport... Your TV manufacturer makes you pay for a manual that you probably wont open, i didnt open the manual of mine, damn it, it's a TV. You probably feel privileged getting it for free but in fact they made you buy it.
Now, I love to read DCS manuals, I would pay for them.
The blocking point for me is that its impossible to prevent hacking it or distributing it illegally for free. Even encrypting it wont be secure enough, nothing can stop screenshots, or printing and rescanning... I suppose they wouldnt want to disable printing.