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!