Manuals like AutoCADs have certainly felt valuable https://i.ebayimg.com/images/g/Gm8AAeSwwIZowjzn/s-l1600.jpg It's not even complete, for instance the ADS manual is missing. It's also a bit more expensive with roughly 3700 USD in 1992.
Oh yeah, when I said £60, I was thinking of even the cheapest consumer-grade software!
Whoa strong nostalgia hit from that photo. I seem to remember the R13 (the last version I used before shifting into tech) stack of manuals was even bigger.
The Office 4.3 set of manuals were large too, but didn't have the information density the AutoCAD ones did.