MS Office Pro is £420 [1].
A Dell all-in-one (not especially budget), is £580 [2]. A bulk buy for enterprise would be cheaper. This is inclusive of the cost of MS Windows OS.
In the UK a computer that can run MS Office decently costs around the price of the software.
You can see why MS create a new version every few years; but why do offices keep buying it.
[1] - https://products.office.com/en-gb/buy/office [2] - https://deals.dell.com/en-uk/productdetail/2sue
The shift was in computers, from enterprise to consumer, and the software followed.