At the time, a CP/M machine was a business machine, because it could run a word processor, a spreadsheet, and dBase. (Literally the name of the database program from Ashton-Tate.) So you could buy a "serious" CP/M machine, but not an Apple II, which was an educational/hobbyist machine.
But if you bought an Apple II with the CP/M card, it was a business machine again.
The ways of people and accountants are strange.
But I agree, there was more business software on CP/M.
I swore I would never leave my Apple //e, at least until Borland released Turbo Prolog, and then I absolutely had to have a PC.
Which makes it doubly interesting that the AppleⅡ eventually shared the same fate to allow Macintosh LC systems to run old edusoft: https://en.wikipedia.org/wiki/Apple_IIe_Card