Accountants, and individuals within all kinds of businesses (what we today would call shadow IT). Imagine something like this:

* Person who deals with numbers all day goes to a computer store to browse.

* He sees VisiCalc, and immediately understands what it can do. It *blows his mind*.

* He wants to buy it right away. Pays for $2000 Apple II computer with disk drives to run $100 software; price is no object.

* Shows friends and colleagues.

* They rush to computer store. Repeat.