What are you going to use if you don't get one?
How do you think we rebuilt and serviced our Minis back in the 70/80s?
Well, he could use the internet. I mean, there's a forum you're posting on here that has a load of technical information about Minis on it. It's not the 70s/80s any more and times have changed. There's a wealth of free information out there.
In all honesty, though. My Dad used to collect Haynes manuals and I've kinda carried on with the tradition, so I do enjoy buying them. I wouldn't say they are 100% necessary now, but they do have their uses. 