I have mixed feelings about this. At one time most makers had workshop manuals on sale to anyone. I bought a factory manual for my SD1 from the local dealer not long after I bought the car - and it cost about 30 quid. And of course a paper manual produced in low volumes has a very high production cost. CDs cost pennies.
I enquired about buying a manual for my E39 after I bought that too - and was told there was no such thing. So when pirate copies of the TIS appeared I had no qualms about getting one.