Regular customers pretty much only buy Office through OEM when buying a new laptop.
Back in the olden days, I used to work in retail and sold thousands of computers. I can only recall a handful of people ever buying Office with their computer, and there was no advantage in price for doing so. Most people bought it separately.
Also the type of people who buy Office tend to be businessish types. Grandma isn't buying $120 software with her $300 computer (she will buy a $200 service plan, though! )